Branden,
Welcome to OldMiniBikes! If you search around on Ebay (Evilbay) you'll find lots of minis for sale. However, some are over priced and shipping would be a killer. :shrug: I don't know how close you're to Michigan, but many knowledgeable members live there thriving with mini bikes! :laugh: If you're able to drive to Michigan, you would have no problem stealing a mini or two. :devil2: Plus, you'll meet many great guys to talk with! :thumbsup:
As for commonly found minis.....I'd have to say Rupps, Bird, Doodlebugs, Azusa, Taco, Cat, Big wheeled bikes (boonie, super bronc, tote gote) and so on..