As an instructor you are eligible to join ProMotive.com. It is an outdoor industry related group that offers training/discounts from quite a few companies (around 100).  It is free and you join a "team."  The group you need to request is "Tactical Instructors." If you need an invite let me know, I can send one.

Here is an invitation link: Promotive

They offer discounts on a variety of manufacturers, mainly outdoor sports type gear.

There are a few but a few that I remember off the top of my head are: Woolrich Elite, Eberlestock, Gregory, Gerber, SOG, Crimson Trace, Leupold, Bushnell, Big Agnes (camping), Camelbak,  Helly Hansen, Spyderco, Fenix, NovaTac, WigWam.

The only disadvantage is that availability of products and pricing really varies from vendor to vendor.

Membership is free so check it out!