Nexus 4

We're not really recommending that you agree to a two-year contract with an operator for a Nexus 4. But if you just have to have one, and if you just have to have one for about one-fourth the cost of the base 8GB model, T-Mobile still has them on sale over the weekend for $49. That's with a new two-year agreement, it's available online only through Monday.

Source: T-Mobile; Thanks, Aric!