Walmart has some interesting stuff lately for models.
I was at the one in Natick, MA yesterday and they have these $10 circle track cars that can be scavenged for tires, rims, shorty headers with dumps, and engines. I found a 1/24 scale Pinto (you have to build it) diecast metal kit for $1 there on clearance and will be combining it (one day
) with an AMT '35 Chevy Sedan (tires, rims, engine, exhaust) to make a Franken Pinto!!!!!
They also had a '70 Challenger R/T convertible amoung other stuff. Thier prices are cheap enough that you can just buy kits for parts. Unfortunately, the '67 GTX 2-n-1 kit didn't have the Keystone Klassic tims I was told it was supposed to have but had Cragar S/S rims.