Not advertising but there's a great place I got mine from
gamefunk. They're the new legit 2200mah that mysteriously disappeared from all my local stores (Target, Bestbuy, Fry's) when they were announced a year and a half ago (was it?) ever since the pandora fiasco. Anyway, I ordered 2 from there and they snugly fit in my fat PSP.
Oh, and I heard about them from CAG. The customer service was kind and offered a replacement when the first one I complained in the CAG forum (one of the reps were there) was a dud, but it turned out my PSP was reading the charge correctly until after a few charges. I did went from 1800mah to 2200 mah after all. Got myself a few more hours easily.