Cute Bloat and short-hair Eden promo cards worth

I got an offer of 100€ for those two promo cards and since the prices seem to fluctuate a lot on Ebay I'm not sure if that's a good offer. Does anyone here know the market for these cards and what I should expect to get for them? Same thing with the seven tapeworm promo cards. I just have no idea where to find what a good price for these is nowadays. Hope someone can help.