Couldn't find this exact deal posted before, although people seem to be aware you can get GBA bits and bobs in poundland. Still, thought this was worth a mention....
Joytech accessory pack includes...
Zip up carry case with room for a few games
2 Screen Protectors
Screen wipe (on a string which ties to the GBA)
3 Plastic Game Cases
Seems a baragin all that for £1
They had loads of them in my local store.