Woot offers Wateraft 5ft x 10ft Floating Mat for $149.99 (orig. $299.99). Free shipping for Prime Members.

Product Description:
The Lite Wateraft is made of marine-grade polyethylene foam which requires no air or additional flotation attachments to work. Our Waterafts were designed to offer the user a safe and fun experience without any hassles. There are no ladders, sharp edges, or metal fasteners to worry about. All rafts are lightweight, easy to transport by hand or on your boat, and will not retain water. You just unroll and get on the water!

•  Factory Installed Tether System
•  Includes Storage Straps
• No Roll Memory!
• 2-Layer pad with Patented FlexCore Technology
• UV Stabilized Graphic Film
• 100% cross-linked polyethylene foam
• Easy fun: simply unroll and enjoy!
• Recommended handling: 1 Adult can easily move it around
• Flotation: Accommodates 4 adults or 600 lbs of distributed weight
• Maintenance-Free
• Made in North America