Argos don't have them in any branch and the one in Stephens Green told me nowhere is taking names! I even got my sister to try a load of shops in London.
So far I've tried Argos, Xtravision, HMV, World of Wonder, Smyths and all electrical type shops. Komplett were looking promising at first - PSPs were due on 9th Oct then 24th Oct then 11th Nov and now it just says "Temporarily out of Stock".
I've noticed that play.com seem to have the best selection of psp movies and games.