Star BM's were pretty popular a few years ago. A bunch of them must've been imported all at once or something.
They're all-steel 9mm's that (as you pointed out) resemble a 1911 in form and function, and usually cost a lot less. They're fun to shoot, too. A little heavy to lug around, but pretty good pistols overall.
About five years ago, $200-225 was a good price, but I think it's gone up since then. Might want to check Gunbroker, AuctionArms, and Gunsamerica to see what people are getting for them (remember to adjust for shipping & transfer fees).
Mags can be expensive, so you'd have to discount for the fact that you don't have one.