Amazon has the Oregon S62 AdvanceCut Chainsaw Chains 2-Pack (S62T) for $18 with free shipping on $25+ or with Prime. List price: $43. Features chrome outer layer and hardened rivets, built-in Lubri-Tec automatic oiling system, .050" gauge, 3/8" pitch . Fits these chainsaw models with an 18" bar: Atlas 56937, Craftsman CMXGSAMCN4218, S185, ECHO CS310, Ego CS1800, CS1804, Greenworks GCS80420, Husqvarna 240, 120 Mark II. #1 Best Seller in Chainsaw Accessories.
Has excellent Amazon Reviews.