Um, the contract was offered publically to anyone who opened it. The price agreement works as follows:
*You take the product to the seller and offer a price
*the seller agrees the price and the contract is set, or the seller rejects the price and the contract isn't set.
The price on the shelf has nothign to do with the contract being in place. The contract isn't set until the payment offer is accepted. The shelf price is just an indication of what the seller will accept, and what they wont.
I took the product offered by microsoft to their salespoint, and they accepted my offer. But "lol" at knowing what you're talking about