t-mobile .com. The deal is good for new and existing customers. Shipping on T-Mobile.com is always free.
The eligible phones and their prices are:
Samsung t369 QWERTY slider $69.99
Nokia X2 QWERTY candybar $79.99
Samsung Dart - refurbished Android phone $99.99
Samsung Dart brand newAndroid phone $149.99
Samsung Gravity Smart refurbished Android QWERTY slider $149.99
LG Optimus T new Android phone in Black or Titanium $179.99
T-Mobile (Samsung) Sidekick 4G $329.99
Samsung Exhibit II 4G Android phone $329.99 (Not a good deal -Amazon and Walmart.com sell this phone for under $200 everyday!)
T-Mobile (LG) MyTouch Q Android phone $349.99
Nokia Lumia 710 Windows Phone $349.99
These T-Mobile refill deals occur frequently, but they don't usually last more than a couple of days. This one ends Thursday April 26th, while supplies last, so don't delay if you're interested.