We experimented with print ads, Google adwords, and banners on a few other sites for our DVD products. What seems to work best is our own referred traffic from our membership websites.
Boy Fuck...thanks for your reply. Do you sell your dvds directly on your membership site...or do you send your members to another retail web site?

I have been toying with creating a members only section with Studmall.com, but is that even possible if my site was build using X-cart?