We didn't get any M3 Evos in the US. None. Only first gen cars. Most E30 M3s are track toys nowadays, so your chances of finding a US spec car with a bunch of Evo parts already on it are pretty good.
I suggest you check out BMWCCA listings in the Roundel, BMWCCA Club Racing listings and various Bimmer websites.. just do a search, they're all over the place.
M