Thumb Score: +8 Harbor Freight [harborfreight.com] is offering "30% Off Any Single Item Under $10" coupon. Save 30% Off any single item under $10 with coupon code 63327860. Valid from Friday, 4/26 through Sunday, 4/28. Valid in-store and online. For Inside Track Club Members: it's 30% off items under $20 (instead of $10). *Limit 1 coupon per customer per day.