Woot offers Airhead Big Mable, 1-2 Rider - Inflatable Towable Tube for $149.99 (reg. $347.99) free shipping with Prime. 

Product Description:
The Big Mable is a classic towable with all the features you expect from Airhead. Made for 1-2 riders and featuring multiple padded handles, air cushioned stabilizer walls, and EVA foam pads, you can spend the whole day riding in comfort. The Big Mable has a heavy-duty full nylon cover for durability, and dual tow points for a variety of towing options. Combined with Airhead's Patented Speed Safety Valve, you'll spend less time worrying about set up and more time on the water.
 

• Capacity: The rider tube is designed to accommodate 1-2 riders, for both solo and tandem water activities and various watersports. Its size and capacity allow individuals or pairs to enjoy the ride up to 340 lbs.
• EVA Padding: These comfy foam pads are strategically placed to provide support and cushioning, minimizing the impact of bumps for riders ensuring a comfortable and enjoyable ride
• Double-Stitched Nylon: The tube is fully covered with double-stitched nylon, which ensures comfort and longevity, making the tube a reliable choice for extended periods of boating and watersports.
• Patented Speed Safety Valve: This speed valve, offers a simple and efficient mechanism for inflation and deflation which streamlines the setup and storage process, providing convenient experience.
• Kwik-Connect Tow System: A unique feature that simplifies connecting the tube to the tow rope. This system is designed to be quick and easy, streamlining the setup, ensuring a hassle-free experience.