Prices fluctuate quite a bit depending on which day and supplier. Check-out: Amazon; Best Buy; Costco; Radio Shack; Sam's Club; Walmart,* etc.-etc. for best current upgrade deals. *[ notice how I did that little list in alphabetical order?

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A week ago on black friday, Sam's Club had the AT&T @ .96 cents, and Costco had theirs @ $29.(after rebate or Visa gift card or something like that).
Some other places were @ $49.
Frankly . . it became much too depressing to me to keep paying attention to. lol
Happy hunting.