Until September 17th, the e-book of Walter Jon Williams' Nebula-nominated Metropolitan is available for only 99 cents at a variety of providers.
Walter's one of the best writers in science fiction, and Metropolitan is one of his best books. If you don't catch the 99-cents sale, pay full price; it's well worth it.
I also recommend his Dread Empire's Fall trilogy (The Praxis, The Sundering, and The Conventions of War), big-concept epic space opera at its best. And City On Fire, the sequel to Metropolitan. And Hardwired. And Aristoi. And the short story collection Facets. And... well, just about anything he writes. (I haven't gotten to the Dagmar Shaw series -- This Is Not A Game and its sequels -- yet, but I'm looking forward to them.)