I agree the Spider-Man 3 figures are too much. I saw them at a couple of places going for about $9.99-$13.99. Wal-Mart has them for $7.88.
Saint553 is right about the Scarlet Witch figure, I found two last month, one at Wal-Mart for $7.88 and the other at K-Mart for $8.99. She's pretty easy to find now. She wasn't worth $90 bucks, but definately worth a purchase nonetheless. I picked up both.
Another series I can't understand why it's so much is the 'Real Action Heroes' (RAH) figures. Those go for about $200 a piece. I don't know what makes them so special, maybe it's the material or some special mold they use, but I can't see paying that much for a 10-12'' figure. I wanted a couple of them, but after seeing that price I decided to pass.