Walmart offers three Intex Sport Floating River Inner Tubes in Blue or Camo for $10.02. (You can mix & match colors.) Choose in-store pickup to dodge the $4.97 shipping charge. That's $3.34 per tube and $31 under the lowest shipped price we could find for this quantity elsewhere. Each tube measures 39" in diameter and features grab handles and connectors for attaching to other Intex floats.