Ingram and B&T are about the closest that members of this forum are going to get to distributor levels, but bear in mind that markup on new release DVDs and Blu-Ray is essential nil. Amazon sells BR discs for 25-30% under retail -- the Ingram price on small quantity orders isn't going to be much lower. And eBay sales tend to be even cheaper than that, as you have people offloading duplicate gifts, unwanted stuff, etc. that is nearly new. Just a caveat.
Frank