They advertise it as "the Costco of the gun industry" and that seems pretty accurate: generally better prices though possibly lacking more uncommon items. I got started with a $0.99 trial month, then ran about a year at $10/mo. Been very pleased with prices and availability for RMRs, Eotechs, Lancer and Glock mags, Surefire lights. Haven't really dug into the other areas of inventory yet (ammo, guns, NFA) but you do need to know what you're looking for. Actually saved so much and have enough future plans that I requested a lifetime membership. They told me they're considering offering it and not yet gone public, but went ahead and let me buy one for reaching out ($299).
Post specific items within these categories and I'll snapshot some current prices and inventory.