You can get that Mr. Fusion at O’Reilly Auto Parts. It’s right on their web site:
http://www.oreillyauto.com/site/c/detail/EB00/121GMF.oap
Probably need the Flux Capacitor, too.
http://www.oreillyauto.com/site/c/detail/EB00/121G.oap?keyword=121g
Actually, there is a real “flux capacitor”. And it looks nothing like that picture.