Sears offers the Craftsman 1/6-Horsepower 6" Bench Grinder, model no. 21124, for $49.99 with free shipping. (Amazon offers it for the same price.) That's tied with our mention from three days ago, since expired, and the lowest total price we could find by $40. It features a 36-grit wheel, 60-grit wheel, and lamp.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.