Photo Warehouse aka ultrafineonline.com has some Fuji APS film still for sale, and also some of the Kodak C-41 black & white Advantix film. The film itself is 24mm wide and would not necessarily be difficult to process in a home darkroom if you could adapt one of the adjustable plastic reels to that width.
Also http://www.filmscanusa.net sells APS film holders to fit most popular scanners (or you could just center it in the regular 35mm holders taping down each end to the glass).
Perhaps the bigger question, is whether there are any APS cameras out there that will work with reloaded, non-perf film 24mm film. The cartridges themselves would not be that difficult to reload (as many do with 110 cartridges for the Pentax auto 110 and a few others that do not require 110 perfs).