Waste of a couple hundred bucks IMO. If it's bad enough to need chains on the highway with a loaded down 4wd dually, i.e. Glare ice, you're not going anywhere anyway. Don't worry about it. Besides you're going from Victoria to AZ? not like you're crossing the Rockies and can't be late?
Otherwise, Les Schwab, or buy a new used set off craigslist on your way through wa or or from one of the hundreds who thought they needed chains too but don't.
I bought an essentially new set of 4 for $50 for a couple of the sketchy forest roads needed to acces where we Sno machine.