As I have read many posts concerning the validity of so-called contracts, I have become increasingly radicalized that the "contract", EULA, and/or license in your retail box is not valid. Of course I am not a lawyer and this is my lay opinion.
One aspect of contract law, as you point out, is the "meeting of the minds". When a consumer can't negotiate with a company representative there can be NO meeting of the minds. The simple act of buying a retail product does NOT constitute acceptance of the terms and conditions. In fact, I would advocate that a customer could leave his/her own "contract" with the sales clerk and claim that that is a valid contract. After all, didn't the clerk accept the money thereby binding the company selling the product.
Anyway, this leads me an issue that I have had with some Libertarians. That is that corporations, in the name of doing business, can do whatever they want. The only resource that the consumer seems to have is not to buy the companies products. In the extreme this is manifested by "contract' provisions that say that we can change the terms of the contract anytime we want. Not only that but, if you have something like
purchased rented music we can deprive you of that product anytime we want.
If we are to have contracts that mean anything, any company that wants to assert that it has a contract with a customer must have an authorized person at the store who can negotiate with the customer. Companies of course would howl that this would be too expensive. To bad, corporations to not have a right to unilaterally strip the consumer of their rights and must be willing to negotiate.