Rainier Arms offers memberships to their apex Club for $99.95 per year. The club membership gives you discounts on their already reasonably priced items, as well as free ground shipping and occasional access to special offers. For anyone who either makes regular orders or is looking to buy a fairly expensive item, the membership can pay for itself quickly.
There is no set discount amount, and the amount off varies from item to item. On less expensive items the discount is often only a dollar or two but it can be a significant amount on larger purchases. Finding the best deals for you is a matter of searching through the site and comparing prices.
The special offers can be fantastic if they happen to align with your needs, or if you are open to finding a place for any good deal that you come across.