I agree with @fireside that you’d need some kind of business agreement with the manufacturer to obtain favorable pricing leading to better margins. Of course. But I don’t see any legal issues arising from that. (The link was unhelpful—we’re talking legitimate business here, not selling fakes, pirated goods, counterfeits or other ripoffs.)
But I still think that you’re the one flirting with illegality, @Cruiser, in your attempts to control the entire distribution channel. Depending on how you go about your efforts to “maintain a price point”, you’re skirting with restraint of trade issues. (It should be simple to fend off the complaints of price gouging—you weren’t the seller, and apparently you would offer the goods at a lower price than the seller did—so it’s a buyer issue, and his lack of due diligence or shopping ability.)
I can completely understand and support your “desire to know” the who, what, where and under what terms your goods are sold—that’s simple market research and cognizance, Business 101—but the attempt to “control” that is what gives me pause.