By Bret Kenwell Costco stock is falling on earnings, but support is nearby. Here’s how to trade it now. Costco Wholesale (COST) – Get Costco Wholesale Corporation Report is looking to escape this week without too bad of a day on Friday. Shares are currently down almost 4% after the retailer reported earnings. We saw Best Buy (BBY) – Get Best Buy Co., Inc. Report and Target (TGT) – Get Target Corporation Report both roar higher on earnings this week, so bulls were likely optimistic with Costco’s results on deck. However, the stock rallied for six straight sessions coming into the report, climbi…