There's a good deal on from now until Jan. 31 for buyers in the U.S. on a 10-pk of Verbatim DVD+R DL discs at buy.com:

http://www.buy.com/retail/product.asp?sku=201752095

$24.99 with a $7.00 mail-in rebate = $17.99. I got free shipping, too, but don't know if that'll last...