It’s easy to become a customer by going to this link to enroll. 
On that page select “Join as Customer” 
Then click the button that applies to you: “I’ve been referred” and use ID# 1290680
For the best price by far select autoship option.
If you prefer, please call me @ 904 834-0524 to set you up as a preferred customer before you order to get a 28.6% discount.

The sales of Immunocal and other products from Immunotec are forbidden on Amazon, but Amazon is not protecting it’s customers by allowing the sales.
Here’s why from an Amazon customer: “Very disappointed with the quality of this product. A cheaper whey protein will do the same.” There’s no way of knowing if you get the real Immunocal product or a cheap knockoff. Caveat Emptor