Samsung Galaxy S4 Available to Pre-order at Walmart for $168
You can also activate service with T-Mobile or Sprint, according to Walmart's press release. To do so, you need to purchase a $25 pre-order card, which comes with a free $4.99 VUDU credit, and then wait for a Walmart employee to call when the phone arrives in-store. When you go to pick it up, you can choose which carrier you want to run with.
Unfortunately, we don't see that option online. You can pre-order the Galaxy S4 on Walmart's website for $168, but only through AT&T as far as we can tell.
In related news, Samsung today confirmed that seven wireless carriers in the U.S. will offer the Galaxy S4 starting in April, including AT&T, Sprint, T-Mobile, Verizon Wireless, U.S. Cellular, Cricket, and C Spire. You'll also be able to pick up the device through a number a retailers such as Best Buy, Costco, Radio Shack, Target, and others.