stephen: try squadron, greatmodels, tower hobby, there are plenty of new kits out there, although, not sure what time frame you are looking for. also, go to ebay in the "models" section, type in 1/32 and you'll get plenty of hits. primary makers are: ARII, Revell, Monogram, Airfix
also, there are a lot of die-cast kits out there that can be used as is, or stripped and redone. primaries: Corgi, Majorette
i'm also a 1./32 slot car nut and have several different fire engines, two tow trucks, one semi rig, and several cars (aston martin, porsche, jag, datsun 240z) to be used as scenic items on the layout.
and, i'm going to use the 1/32 Italeri Kaman Huskie helicopter on the layout as a rescue bird. not likely prototypical, but, its a funky looking bird and looks cool.
good luck!