I'm shocked that I haven't seen anyone post higher numbers here. I know I've spent $40 on a few CE Valkyries. I ended up selling most of my CE discs for $40-60. I'm not a fan of dropping a lot of cash for one disc unless I know I can get about the same resale out of it if I don't end up keeping it.
I recently switched to all Discraft/DGA, and I'm liking the fact that they really don't have as many collector's discs at astronomical prices. Since switching to Discraft, I don't think I've paid over $20 for a disc. I wouldn't mind picking up a few Cam Todd Challengers however. I've seen them go for about $30 on ebay, and I thought they'd be there for a while, but alas, they're sold out everywhere now.