A limit order. Specifically a fill-or-kill limit order for the cancellation part.

Most people don't realize a limit order isn't "buy at this price" but rather "buy at the best price in my favor, but don't spend more than this much."

Fill-or-kill means don't put it on the books, just get it now or cancel. You can also typically specify whether it is a partial fill-or-kill too (get it all or none at all).