http://www.best3dgraphiccard.com/video-adapter-audio/
Video Adapter Audio
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 Easycap USB 20 Video TV DVD VHS Audio Capture Adapter  US $.88
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 USB S Video TV DVD VHS Audio RCA Capture Adapter Cable US $4.90
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 EasyCap Usb 20 Video Audio Capture Adapter Card Device US $11.11
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 USB 20 TV VHS To DVD Video Audio Capture Adapter Vista US $5.00
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 USB DVR Video Audio Capture Adapter 4 CHANNEL Easycap US $2.90
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 EASYCAP USB 20 VIDEO TV DVD VHS AUDIO CAPTURE ADAPTER US $5.99
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 Easycap USB Video TV DVD VHS Audio Capture Adapter US $4.90
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 Easycap USB 20 Video TV DVD VHS Audio Capture Adapter US $2.99
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 Easycap USB VIDEO AUDIO VHS TV DVD Capture Adapter New US $8.99
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Coby CA-747 Dual Position CD/MD/MP3 Cassette Adapter List Price: $14.99 Sale Price: $2.99 Average Rating:   |
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The key feature on this cassette adapter is the dual position, fully modular adapter which gives you the option to plug this into both front and side-loading cassette players. If you're trying to connect your CD or mini-disc player into a cassette deck, this component should do the trick... 
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RCA Audio Cable Adaptor for Microsoft xBox 360 Sale Price: $4.74 Average Rating: |
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RCA Audio adapter for non-HDMI supported stereo systems. Allows HDMI video to be routed to the HDTV with the audio routed separately to the home theater system. Dolby Digital 5.1 Surround sound output... |
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PCMICROSTORE Brand 4n1 Combo Kit for Microsoft Zune 4gb 8gb Premium Leather Wallet Case with LCD Screen Shield Protector - Bundled with 12v Rapid Premium Car Charger - Home Travel Wall AC Adapter Charger - AV Audio Video Cable - 5 Color Choices, BLACK/RED List Price: $59.95 Sale Price: $29.95 Average Rating: |
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PCMicroStore Branded Non-OEM Case. 1 Year Unconditional Warranty if purchased through PCMicroStore |
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Steren - Video / audio cable - S-Video / audio - 28 AWG - RCA (M) - 4 pin mini-DIN (M) - 6 ft - shielded - black List Price: $5.45 Sale Price: $1.19 |
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24k gold-plated connectors6' |
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Belkin F8V235-12 12-Foot Y Audio Cable List Price: $13.35 Sale Price: $2.42 Average Rating:  |
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This Y Audio Cable from Belkin connects multimedia devices (such as stereo speakers and CD-ROMs) to your PC's sound card. You can also use it to easily connect mini-stereo components to stereo equipment... |
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GE 23294 Audio/Video and Game Switch List Price: $29.99 Sale Price: $12.95 Average Rating:  |
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Audio/Video Game Switch connects portable-Devices to your old TV. Connects up to 4-Devices to TV with only an "F" jack input. Eliminates the need to continually connect and disconnect equipment. Once audio output for use with headphones or powered speakers... |
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6' American Audio/Video Toslink Digital Optical "Lightpipe" Cable (6ft.) List Price: $10.61 Sale Price: $0.01 |
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The American Audio 6' optical cable interconnects A/V equipment with digital input and output jacks. Using the digital connection prevents interference and improves sound quality. These are premium 4mm diameter cables featuring Toslink style connectors with new Justlink? 100% accuracy plugs... |
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USB Phone Adapter for Skype, MSN, Yahoo, USB VOIP Interface connects your home phone to network Sale Price: $19.99 Average Rating: |
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Now you can use your regular home phone for Skype or any VOIP interface! When your regular phone is connected with this adapter, you can dial and receive calls via Skype/VOIP without the need to buyer a SKYPE phone... |
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Arkview Multi-Display USB 2.0 to DVI/VGA/HDMI Adapter External Video Card (Link up to 6 Displays) 1600x1200 High Resolution with RCA Audio Jack List Price: $69.99 Sale Price: $62.50 |
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USB 2.0 TO DVI/VGA/HDMI/AUDIO MULTI-DISPLAY EXTERNAL VIDEO & AUDIO ADAPTER |
Is there an adapter that converts audio/video from an RG-6 coaxial cable to RCA (yellow, red, white) outputs?
even if the audio is just in monaural, not in stereo.
It depends on what is on that coax cable..
If it's a standard def TV signal, a VCR will do the job. What you're effectively looking for is a tuner - the coax cable will have a signal on it on some channel (3 or 4, typically), and you need a device that can tune to that channel and give you the audio and video from it. An older VCR is probably the easiest/cheapest way.
The device that converts a video+audio signal to a coax modulated signal is called an "RF Modulator", so I would guess that an "RF De-Modulator" is what you're looking for, or even just a simple analog TV tuner. A quick google search gave me a few matches that look like what you want ($50 and up, though).
If it's a digital (ATSC) or other signal, you'll want a tuner that specifically handles the type of signal on the coax.