You can ration without price gouging.
How, pray tell? Until the government formally sets out rationing rules the supply is used up. If they’re enforcing price gauging rules suppliers have no reason to ration themselves. If they’re anyhow not earning more money; the sooner they sell out the sooner they can go home. The only reason they would limit someone’s purchase would be out of the goodness of their heart which we certainly can’t rely on.