Worx via eBay offers its Worx Replacement Spools 6-Pack, model no. WA0010, for $8.61 with free shipping. (Amazon and Walmart charge pennies more.) That's the lowest total price we could find by $3. These spools are compatible with all battery-powered Worx garden trimmers.
Sam's Club offers its members the WORX 19" Cordless Electric Mower, model no. WG772, for $379 plus $13.50 for shipping. (Non-members incur an additional $37.90 surcharge.) Features include two removable batteries, 19" steel deck, up to 8,500 square feet of mowing on a single charge, and mulching, bagging, and side discharge capability. Deal ends June 1.