Everything in my collection is PAL 'cause I live in Australia. It's actually pretty hard to get a lot of very retro stuff here, at least in shop's because well I hate eBay. I know I'm restricting myself but I couldn't care less. You could try emailing some of the gaming stores like Gametraders; they can be really helpful...
Did you know that we also get some exclusives? Off the top of my head I can only think about the platinum range for the ps but I'm sure there was more.
You might find that with PAL you get a higher resolution than your NTSC as PAL usually has 576 visible lines compared with 480 lines with NTSC, meaning that PAL has a 20% higher resolution, in fact it even has a higher resolution than Enhanced Definition standard (854x480). In fact PAL has a close frame rate to film.
Also have you tried
www.fullyretro.com? Where do you live? They don't ship to the US or Canada though...