Jeez.. this guy's got a "monopoly" on tanks and air fills, since he owns the only two stores around. Sounds like you're screwed either way.
Looks like that Scuba Toys is about 5 hours drive away from you in San Antonio. If you're buying two tanks, you'll save about $160. That'll more than cover your gasoline for a long road trip. Or just buy from any other shop around though you might have to drive a couple hours. Driving to another shop might be a pain,
but it'll save you $40 bucks on the visual he'll charge if the tank is empty.
You only have to do this one time.
I've never in my life seen an AL80 priced at $200 before.
$20 for a VIP is a rip off also. Big time. most shops charge $5 to $10, with a few in monopoly locations charging $15.
If you do buy tanks locally for $200 each, check the original hdyro date. Chances are that at $200 a tank, they've been sitting there a while and are a couple years old.
This is pretty common in shops that overcharge for tanks, because of their high prices, they hardly ever sell tanks, so then they get several years old and out of hydro before you know it.
BTW... I bought new tanks at Worldwide-Watersports in Key Largo for $99 each, including VIP and airfill.
If you're willing to spend $200 for an Alum 80. I'll sell you every one I've got for that.
Surely there's more than just 2 dive shops in San Antonio? (since you said the two within 30 minutes of your house were both owned by the same person)