Walmart offers the Envion Ionic Pro Combo Air Purifier, model no. CA200B, bundled with the Envion Car Air Purifier, model no. 90IP2RCI01, for $49.54. Pad you order to over $50 to bag free shipping. (In-store pickup is also available, otherwise shipping adds $5.97.) Excluding padding, that's $20 off list and the lowest price we could find. This 12-watt air purifier comes with a base stand and is recommended for rooms up to 250 square feet.