Sears offers the Kenmore Tower Air Cleaner, model no. 88830, for $59.99. Coupon code "SEARS2014" cuts it to $54.99. With free shipping, that's $45 off list and the lowest total price we could find. It features three speed settings, filter change reminder, and comes with two replacement filters.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.