Walmart has the Ozark Trail Single Rider River Tube (3 color at this price point) for $4.98 with free shipping with Walmart+ (30-day trial) or on $35+. Also on sale: 

• Ozark Trail 65" Pool Lounge Float for $5.98
• Ozark Trail Rapid Rider Ultra River Tube for $23
• Ozark Trail 10' Lake and River Lounge Float for $35