Hi Randy and Vlad; that's it in a nutshell, although I tell folks to set up an account with Busse Combat because they're the ones who run the show booths. Y'ou'll have to give them your name, shipping address, email, phone, and your payment info -- they need to know how to contact you, how to process payment for your stuff, and where to send it.
Once they have that information in their computer system, someone who's willing to shop for you can just hand the knives you want (and that are available) to one of the crew along with your contact information. The crew-person will write up an invoice using your contact information, and put it in a box (that they'll take back to the shop once the show's over) along with your knives.
When they return, the office people will charge your credit card -- the charge will be the cost of the knives, plus sales tax for the state where the show was, plus shipping. I'm just warning you that even at show prices, after you add in tax and international shipping and any VAT or import duties that your own country might impose, knives can still cost more than you might think.
Then Amy and the crew from Busse send the knives to you. With Busse handling the transaction, it should be easier to find a proxy though, because their job becomes as easy as picking the knives up from the table and handing them over with contact info -- then they're done.