Where can I get some AT-5?

Hello everyone, Ive read a few subjects on this AT-5 Acrylic Sealant on this forum but I haven't seen anybody saying where and how to get it! I've tried the Gem site and the site they directed me to (wholesalecarcare) but AT-5 wasn't included! It had every thing else from the Gem site! So can anybody help find a walk-in store near San Diego or a no run-around website I can go to! Thank you for any help you can give me.

The gem website lists the phone number. 1-800-447-4gem.