Home Depot offers the Bosch 7.5-Amp 4-1/2" Slim Grinder Kit, model no. 1380SLIM-K, for $48 with free shipping. Outside the mention below, that's the lowest total price we could find by $37. It features a lock-on switch, reinforced wheel guard, and an 8-foot cord.
Amazon charges the same, although it has an estimated ship time of four to six weeks.