Wirefly.com has the Samsung Galaxy S 4G on T-Mobile for $139.99 (580 unsubsidized, 249.99 – 110 instant savings carrier subsidized) with FREE activation and shipping when you sign a new two service agreement.

The Samsung Galaxy S 4G for T-Mobile is the newest and most impressive addition to the Samsung Galaxy Series. This is the follow-up to the Samsung Vibrant with impressive additions. The Galaxy S runs on T-Mobile’s speedy 4G network, comes with the Android 2.2 operating system, a front facing camera for T-Mobile Video Chat powered by Qik, a 5 megapixel camera for high quality photos, a lightning-fast 1GHz Hummingbird processor, and the movie “Inception” ready to view on the 4″ Super AMOLED display! Watch HD TV shows and movies on the crisp, full touch display. With Kindle for Android, you can shop for hundreds of thousands of ebooks. Your Galaxy S 4G also offers all of your favorite smartphone features such as web browsing, email, instant messaging, text and multimedia messaging, and a high-end camera. The new Samsung Galaxy S 4G delivers high quality entertainment everyone craves instantly from anywhere, exclusively from T-Mobile.