But you've got a point. Tor books (
http://www.tor.com/) publishes a lot of my favourite authors, so you've got a chance with them. There are also numerous online publishers who, for a nominal fee, will publish your book, cover design and all. A friend of mine published his book ("The Sky of Peleg" by Twelve, if you're curious) that way. It was pricier than most paperbacks, but it got his work out into the world.
Besides, american publishers often sell books worldwide, if you're worried about widespread distribution.