Alright, so I have my PSP and am -hopefully- getting a better memory card tonight.

My question is what are the best prices?

It has to be a Memory Stick Duo or some iteration thereof.

So far the best I've found is this one:
http://www.newegg.com/Product/Product.asp?Item=N82E16820191417

But if you can find a gig for under a hundred that'd be awesome too

Fry's Electronics usually has pretty good prices on those, especially if they're on sale, but I don't think you're gonna find one for under $100.

FROOGLE!

Gives me unreliable sites that I don't trust.

That's why you look up reviews for those sites at resellerratings.com, or just ignore the ones that are obviously crummy.

I've seen a few Memory Stick Duo 2's or whatever for 50-80 at Best Buy and Gamestop... or are you talking about a specific size.

I can't remember how big the ones I found were, but IIRC they were 128 or so.