Just four days after AT&T cut prices, Apple has dropped the official U.S. price of the iPhone 3GS to US$49. Apple made the adjustment -- a drop of $50 -- without fanfare.

It's widely expected that Verizon will announce its intention to carry Apple's iPhone tomorrow. In fact, it seems to be reveling in the anticipation among consumers a bit this morning, posting teasing tweets to Twitter. With that in mind, it makes sense that Apple would want to clear out some stock, and AT&T would want to lock in as many new 2-year contracts as possible before the big announcement.

We'll have full coverage of the news when it drops. In the meantime, if you're quite happy with AT&T and want a deal on a nice iPhone, here you go.

Update: US retailer Target has also followed suit.

*Verizon is currently in the process of acquiring AOL, Engadget's parent company. However, Engadget maintains full editorial control, and Verizon will have to pry it from our cold, dead hands.

This article was originally published on Tuaw.
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