Gander Mountain cuts $20 off orders of $100 or more or $50 off orders of $250 or more via coupon code "GMH1118". That's the best tiered coupon we've seen this year from Gander Mountain. Even better, all orders qualify for free shipping. Some exclusions apply (including The North Face, Columbia, Patagonia, Carhartt, and others) and sales tax is added where applicable. Coupon expires November 20.