For best results, plan ahead for your trip. If you know river floating may be a serious summer pursuit for you, check out an outdoor supply store like REI for high-quality tubes that will help make river floating fun and safe. We love the Intex River Run Tubes which can be purchased at Amazon. If you wait until the last minute and need to buy a river float quickly, check sporting good stores or even hardware stores near the river. If all else fails, a trusted river float or river-rafting tour company may have tubes available to rent by the day even if you are not on a guided trip.