You won't find Beachbody programs at any straight wholesaler -- BB have their own distributor program. But you can find lots on eBay, CL, Liquidation and at most video wholesalers/liquidators, typically small-medium lots that have been bought off of distributors who overbought and are trying to get out of it. But because Beachbody dropships, these are rare.
If you're planning on moving serious volume, contact Beachbody directly to see if you can put together a deal with them; otherwise, there are scads of used copies available online. Workout equipment and videos are a great used product, because by the nature of the market most are in like-new condition as people buy them and then stack them up in the spare bedroom.
Frank