My local shop has had 7 PSP's in stock since release. 5 were pre-ordered before release and the other 2 sold within 2 days of getting to the shop. I was lucky and picked one up second hand 3 weeks after release for my Son's XMas present.

XBOX 360 is gonna be worse than the PSP. Apparently they only have enough to supply pre-orders and after they have gone there's no guarantee of delivery untill 2006.