where can i buy a rave hydro inflatable watersports toy?

As a boater, I am aware of how great Rave hydros can be, either on your own or with the entire family.
There are different options available.  For the single rider, there is the Rave Sport Hydro Inflatable Water Towable.  For under $150, you can get a single cockpit design (16" x 42") with an inflatable floor and four molded vinyl handles.  This model is comfortable for an adult rider with one child or for two children.
For something with a little more space, check out Rave's Sports Ravenger Inflatable Towable, which accommodates up to three riders. Two riders can sit in the large cockpit (40" long) featuring inflated floors for a softer ride. Soft grip handles with neoprene knuckle guards are provided for the riders in the cockpits, so this is suitable to kids. If you are willing to really extreme, then you want the U SLALOM 3.  This is a controllable towable--you can maneuver, slalom, jump, veer, and do a combination of moves through the boat wake or crest in a straight-line boat pattern. Sounds like the ultimate in family summer fun!