Good stores to order legos?

I'm making a super mario themed lego chess set using the minifigs that are sold for that weird mario game. Problem is most of them are sold with sets. I saw on toypro.com that you can buy a lot of the minifigs seperately but they're out of alot of them especially the ones I want like thwimp and spiny.

Heres the idea: Pawns will be thwimp and spiny, rooks will be bullet bill and bully, Knights will be piranha plant and chain chomp, bishops will be Kamek and maybe mecha koopa? (still working on that) King will be Bowser and King Boo, and Queens I don't know yet.