Unbeatable Sale via Sears offers the Fabrication Enterprises Cando 20-Piece Vinyl-Coated Dumbbell Set with Floor Rack, model no. 10-0578, for $130.52 with free shipping. (sarafankit2009 via eBay charges the same.) That's the lowest total price we could find by $12. It includes dumbbell pairs from 2-lbs to 20-lbs.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.