last time when i research to buy a PSP (i'm a newbie in PSP) at hardware zone, i found that funz at angmokio is recommended.
I tried and i think the price there is good among the shop i checked out.
very good service indeed.
What to do and what not to do when buy PSP:
Don't buy the one with 3.51 firmware(No downgrade),only the one with 3.5 Firmware.
For used one,don't get the one with 2.81 or above(Need game to downgrade)
Buy a copy of Lummines Game,don't buy the japanese version(Downgrade purpose)