Minnesota law that i pulled off Westlaw. I am not offering legal advice, just restating a couple court of appeals decisions talking about the law in this type of circumstance in general:
Generally, if goods are advertised for sale at a certain price, it is not an offer and no contract is formed; such an advertisement is merely an invitation to bargain rather than an offer. 1 Samuel Williston, A Treatise on the Law of Contracts § 4:7 (4th ed. 1990); Restatement (Second) of Contracts § 26 (1981). The test of whether a binding obligation may originate in advertisements addressed to the general public is “whether the facts show that some performance was promised in positive terms in return for something requested.” Lefkowitz v. Great Minneapolis Surplus Store, Inc., 251 Minn. 188, 191, 86 N.W.2d 689, 691 (1957) (quoting 1 Samuel Williston, A Treatise on the Law of Contracts § 27) (3rd ed. 1957)).
Ford Motor Credit Co. v. Russell, 519 N.W.2d 460, 463 (Minn. Ct. App. 1994)
There are numerous authorities which hold that a particular advertisement in a newspaper or circular letter relating to a sale of articles may be construed by the court as constituting an offer, acceptance of which would complete a contract. J. E. Pinkham Lumber Co. v. C. W. Griffin & Co., 212 Ala. 341, 102 So. 689; Seymour v. Armstrong & Kassebaum, 62 Kan. 720, 64 P. 612; Payne v. Lautz Bros. & Co., City Ct., 166 N.Y.S. 844, affirmed, 168 N.Y.S. 369, affirmed, 185 App.Div. 904, 171 N.Y.S. 1094; Arnold v. Phillips, 1 Ohio Dec. Reprint 195, 3 West.Law J. 448; Oliver v. Henley, Tex.Civ.App., 21 S.W.2d 576; Annotation, 157 A.L.R. 744, 746.
The test of whether a binding obligation may originate in advertisements addressed to the general public is ‘whether the facts show that some performance was promised in positive terms in return for something requested.’ 1 Williston, Contracts (Rev. ed.) s 27.
The authorities above cited emphasize that, where the offer is clear, definite, and explicit, and leaves nothing open for negotiation, it constitutes an offer, acceptance of which will complete the contract. The most recent case on the subject Johnson v. Capital City Ford Co., La.App., 85 So.2d 75, in which the court pointed out that a newspaper advertisement relating to the purchase and sale of automobiles may constitute an offer, acceptance of which will consummate a contract and create an obligation in the offeror to perform according to the terms of the published offer.
Lefkowitz v. Great Minneapolis Surplus Store, Inc., 251 Minn. 188, 191–92, 86 N.W.2d 689, 691 (1957)