This isn't a new deal, but I think it's a good reminder of getting a few more $$$ off.
Since there are no more $10 off $30 for returning customers, I just wanted to bring up web certificates. Sign up at http://www.webcertificate.com and you'll get a free $5 gift cert (a mastercard number to use anyplace online).
But that isn't the deal.
I got a new yahoo email account so I could use the $10 off $30 as a new buy.com shopper. I transferred over $33 (plus webcertificate.com charges $1 for the transfer) from my Visa to the web cert and got 2 DVDs for $33, including the transfer fee, tax and shipping. Both DVDs I ordered were already heavily discounted from any local price I could find (and much cheaper than either Amazon or B&N), so it worked out as a buy one get one free deal.