This is a straight breach of contract
if the manufacturer refuses to honor the price after you have relied on it in quoting a customer, and the customer accepts your offer.
Otherwise, while you could argue that the deal represents a violation of the Sherman Antitrust Act (exclusive dealing that tends to create a monopoly), it would be very difficult to prove, unless there are other distributors such as yourself and only one gets these deals. Then, you could make a reasonable argument that the manufacturer and its selected distributor is trying to drive all but one distributor out of the market and create a monopoly.
In my view, the better argument here is that (1) You were given a price; (2) you already have a deal with a customer; (3) retraction of the original price damages your profit margin; therefore the manufacturer must maintain the price or you will be forced to sue for the damages sustained by the manufacturer's retraction of the offer.
Hope this helps.
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