There seems to be a $29.99 Mail-In Rebate available if you check their weekly ad on page 24. $49.99 - $20 Instant - $29.99 MIR = FREE (you pay sales tax).
I'm not sure if it is available in every area, but to check, click here: http://www.bestbuy.com/site/index.jsp? and click on the Weekly Ad link at the very top left corner of the page. It will give you a pop-up where you enter your zip code for the ad to show up.
yeah, that was the original link I put up early this morning - however if you read carefully, you'd have to buy some tax software too - hence I chaged it to what you see here.