Though hard facts on the HTC Thunderbolt's availability were hard to come by, conflicting rumors were flying fast and strong -- now, a Best Buy ad seems to clear most everything up. Like we'd originally heard, the 4.3-inch LTE smartphone will launch for $250 on a two-year contract -- or a wallet-crushing $750 without -- but the key ingredients here are three words at the very top. The Thunderbolt is apparently a "national retail exclusive" for Best Buy, which explains how the device could simultaneously
