Specific carrier availability and exact street date not yet known
RadioShack is opening up in-store pre-orders for the Samsung Galaxy S5 tomorrow, March 21st, and sweetening the deal even more by offering a $50 discount when you commit to buying before the phone's release. Which carriers it will have on offer isn't noted, although each of the major U.S. carriers has confirmed that they will carry the device — you can bet at some point RadioShack will be offering all of them.
Devices pre-ordered through RadioShack will be available "starting in mid-April," and will of course be subject to availability of stock. Pre-ordering should get you near the front of the line, however, assuming there aren't any major stock issues with the launch.
If you're looking to save even more off the cost of your new Galaxy S5 purchase, RadioShack is also offering $75 to $300 more in discounts if you trade-in a working smartphone through it "Trade & Save" program. This isn't a new program, but it's always worth reminding folks when they go to get the next big thing.
Source: RadioShack (PRNewswire)