I don't think that's a contract you want to engage in. There are no terms for timing. A dollar today or in 10 years? It will be difficult to prove these details were known or that the offer took place at all, which is why you want things in writing - which is the case for wormhole.com. It's also interesting to note that a verbal contract is not sufficient to form a contract at price points over a few hundred dollars.
I think you'd be surprised how liberally courts have discovered implied terms in contracts where the parties have omitted them. There's a whole body of law on it, and courts have demonstrated considerable unwillingness to void contracts for uncertainty.
Also: about a zillion successful purchases at yard sales indicate to me that this is a pretty good way to form contracts of sale.
> Also: about a zillion successful purchases at yard sales indicate to me that this is a pretty good way to form contracts of sale.
In yard sales (and most retail situations, too), contracts of sale are usually formed with the tender of payment buy the prospective buyer for a specific set of items at a price stated by the seller as the offer, and acceptance of the tendered payment as the acceptance; they sale contract is formed fully executed, not as an executory (with some obligations still unfulfilled) contract.
The original circumstances were, in fact, written, and the example quoted above was below such threshold. As such, I wouldn’t believe the note on verbal contracts is relevant to the matter at hand.
Take from this what you will.