From the rebate form:
Offer good only in connection with the purchase of two new in-box CDJ-350s AND one new in-box DJM-350 purchased from an authorized Pioneer DJ dealer in the United States or Canada from March 1, 2011, through August 31, 2011.
The rebate is open only to residents of the United States. Employees of Pioneer and their families are not eligible. All federal,state and local laws and regulations apply. Void where prohibited by law.
So if you don't qualify, you would have to purchase the case - although the model they've specified on the promotion (with the Pioneer logos) may not be available to purchase from retail, it would likely be without the Pioneer logos.