There's a good chance you've already heard a thing or two (or a hundred) about the BlackBerry Bold 9900 series, so by now you have a good idea whether or not you'll want to pick one up. So if you're leaning toward "buy," T-Mobile's got one coming to a retail store near you on August 31st, with the phone on presale for business customers starting today. Procurers of the new device will need to shell out $300 after a $50 mail-in rebate. Early adopters, start your engines! The ull press release can be found after the break.