March special offer, maybe?
Businesses usually have their reasons for price changes.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
it was likely a promotional price. they do it all of the time. my buddy got the droid4 a month ago for $99.99. the day after he bought it, it was $199.99. they always run promotions for a while. i would bet that they dropped it to $29.99 to see just how many people are actually interested in WP7 (or whatever the platform is called).