Comment Re:Hmmmm ... legality? (Score 1) 138
You can already do that. Amazon even has a policy of holding processing of credit card transactions for a short window (usually 30 minutes) so that people can cancel mistake orders before the charge occurs.
Even after that, until a product has physically been shipped, both the seller and the buyer can cancel an order. Depending on the reason there may be penalties (a ding to the performance rating for the seller, for example). Buyers generally are never penalized for anything, particularly on Amazon.