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The price of the same item may depend on the seller. Motive Products brake bleeders are sold on Amazon by at least two different vendors (Motive Products and Motive Gear). Vendor A may not participate in Prime, while vendor B does. To compete, Vendor A has to offer a lower price plus shipping. Without Prime offering free shipping, Vendor A might charge the higher price PLUS shipping. BTW, both the vendors I found sell at the same price.
Also, Amazon doesn't offer everyone the same price. They may have thought you were a better demographic to offer a cheaper price to.