You should speak with a local business attorney. You can use Avvo's "find a lawyer" tool to assist you.
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I would want to understand your situation in much more detail and context before offering any opinion here. It sounds as if you may be conflating two distinct issues, but I am not sure.
That said, and if I do understand this much, you are free to buy and sell anything you want and at any price so long as it is legal merchandise. The first sale doctrine protects you in this context. But you cannot use the features, logos, images, etc. of brands without permission. If you are in a MAP agreement, you must adhere to that pricing structure. If you are not an authorized distributor or retailer, the brand may come after you for violating copyrights and trademarks assuming you are because that may be the only cause of action they have.
I strongly suggest that you reach out to a lawyer (perhaps several) in private for a free phone consultation and get some specific insights on your situation. As noted above, I am not certain if I am understanding you correctly here.
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"I am new in this business and need any competitive edge I can get against the big boys".
The competitive edge you need is a sharp lawyer. The big dogs have them and if you want to play with the big dogs you need to have one to, otherwise you need to stay on the porch and let the big dogs have the run of the yard.
It appears you know just enough trademark law and copyright law to get yourself in a melluvahess.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.