A 20GB ps3 is very old (USA Nov 06) for a game console and condition would play a major part in it's value as would the location of where the model was released.
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Yes you can at some stores reduce the price on a new PS3 by about $20-30 for a complete working PS2. Amazon trade in value is a little lower for most PS2 models
20
Depends on the value of the Guitar and the PS3 model and condition
All models of the PS3 except the first 20 GB model have WiFi
Try to determine what is not working. Sometimes it is the disc drive and games and movies do not work. A broken PS3 does still have some value with the highest value to the 4 USB port PS3 models.
About £20
$20
As of 12-12-20, Minecraft is available for the Sony PlayStation 3.
3-5$
The PS3 slim has a Sony PS3 stand for vertical placement available for about $15 from amazon.com and other sources and the full retail is $20. YES
Gamestop has a September 20 2011 release date for the PS3 and Xbox 360 edition