Right now, eBay has a pretty good deal on an AT&T Galaxy S5 as well as a Verizon Galaxy S5. The AT&T version is unlocked and will work on virtually any GSM network here in the US. While the Verizon network may work on some (due to it being a world phone), but the AT&T model may be your better bet. Right now the AT&T model is $419.95, and the Verizon model is $459.95, and it's available in black, white and gold. You can grab them from the links below.