i see you are new. i think i will be more trusting today and bid on your psp. i have fixed one and it isn't too hard, a bit spendy for the screen though. starting out with a big item, that's gutsy. i wish you good luck with your auction.
if you get a large bubble mailer and just fold some card board over the psp, it should only cost aroud $3 to ship parcel post. it isn't the best way, but i think it is the cheapest. good luck!