Kmart offers the Kenmore 1.1-Cubic Foot Countertop Microwave, model no. 73116, for $59.99. Coupon code "KMART5OFF50" drops it to $54.99. With free shipping, that's $65 off list and the lowest total price we could find. It features a 12" turntable and 1,100-watt output.
Of note, Shop Your Way Rewards members may have an additional 15% or 20% off a single home item coupon on their deal center page. They'll also earn a Kmart credit with this purchase and may be eligible for additional credits and discounts.