Hello just been in 2 gamestation (liverpool) and they had a few packs called VGA Essential Packs for the PSP for just 1p.
In this pack you get:
PSP Docking stand with charging socket.
USB data cable
Game Cases x2
Screen Protector sheet with screen applicator card
cleaning wipes (dry and wet pack)
Anyhow they had 2 of them (from what I could see) in one of the stores and I bought them for 1p each. Then the other store had a few more of them in and bought a few more of them they did have a few more but they where behind the counter and was a little bit embarrassed asking for 1p items.
So have a look in your local GameStation might get a few am guessing you should get at least £5 on ebay.
Ill post a picture and recipe later on.