Yeah, the Clockwork Knight games are simple fun. For that price, certainly get them if you like platformers.
As for Saturn Bomberman... those desired Saturn games keep going up and up in price, don't they. I have quite a few Saturn games, but I don't have any of the really valuable ones, unfortunately -- Saturn Bomberman (US), PDS (US), Burning Rangers (US), Radiant Silvergun, and such. The most valuable Saturn games I have are stuff like Mega Man 8 (US ver.), Bulk Slash, and Soukyugurentai Otokuyo... and note that I paid $50 for MM8 a few years ago, not what it goes for now. I should just get a Japanese copy of Saturn Bomberman sometime; even if I would rather have the US version, for English text and the added multiplayer stages, it's not worth the huge cost.