Just an FYI on Tampa Bay Saltwater - he has punkani that he has maricultured as well, not just the south FL quarried rock and Walt Smith 2.0 stuff. You just have to ask for it when you order.
As for the order form, phone call and/or email process, it's really pretty quick and simple. I ordered a 20lb 'package' two years ago. It was pretty quick and painless ... even despite the fact that I did it over the the Xmas and New Years holiday week.
Just a guess, but I suspect it's not a 100% online order process because there are a lot of choices involved - such as letting them know what type of rock you want, what size pieces your prefer, etc. - and AFAIK, they're just a small family operation without the manpower or marketing budget to manage a website cart that sophisticated. And they don't really need it ... their customer service is fantastic. Search the forums for dissatisfied customers and you probably won't find many.
As for the picking it up at the airport part ... the shipping is already expensive (but worth it IMHO given the insane amount of life on the rocks) because it ships fully covered in water (vs wet newspaper)...
Shipping via freight on daily passenger planes to local airports is the only way to keep the cost from being so insane that it would be unfeasible. Like I said, it's been 2 years since I ordered mine ... but I believe he does offer FedEx overnight if you really want it. Just make sure you're sitting down and have smelling salts on hand before you ask for the FedEx shipping cost.
Not trying to sell you on it. Just want to pass along some firsthand experience to help you make an informed choice since there really aren't many options left anymore for true 'live rock' available these days.