For its members only, Costco offers the KitchenAid Professional 600 Series 6-Quart Stand Mixer in Silver, Black, or Red for $279.99. This $50 mail-in rebate cuts it to $229.99. With free shipping, that's the lowest total price we could find by $120, although we saw it for $10 less the week of Black Friday. This 575-watt bowl-lift mixer features 67-point planetary mixing action, 10 speeds, a pouring shield, and paddle, dough hook, and wire whip attachments. Deal ends March 5.