[Questions] Found these in my basement from when I was a kid! worth anything?

Found these in my basement from when I was a kid! worth anything?

You can get a general idea of how much a card is worth by averaging out the prices of recently sold items on eBay (past month should suffice). Just make sure it's the same version (language, set, edition, and holo/non-holo) and that you ignore graded and obviously damaged cards (unless yours are graded/damaged, of course).

Most of these look a bit too "played" to go for much. Blatoise looks pretty decent though, which is good since I'm pretty sure it's the most valuable of the bunch anyway. It's been averaging about $40 this past month in moderately played condition.