If you have the money, go to a Pawn Shop, buy all of the DVDs they have just collecting dust. Pawn shops have a ton of these and cant do much with them, people bring them in and throw them in with whatever they are selling to try to make an extra dollar or two. Nobody goes to a pawn shop to Buy DVDs. They don't want to sell them on eBay because of the hassle. If someone has 600 DVDs, I'll offer to buy 500 of them for 50 cents or 75 cents a piece. I will pick out about 100 titles I know won't sell for shit on eBay.
Group them in lots of 12, use the most popular film(s) as keywords in the title.
This is one of my favorite methods, and you will likely make an extra couple dollars doing it. I usually make enough to pay the overhead and labor it costs to have this done, so I don't lose money.