Mike,
Below is contact information for what used to be Roleez and is now New Concept Products. The company at the Wheeleez link bought a big part of the Roleez business, but they don't make the catamaran beach wheel systems -- New Concept does that.
Also, Bill Tuggle, formerly owner of Roleez and now New Concept, says the wheels are new and better now, but we got the impression that the new wheels don't fit on the old systems. So check on that before you buy. I think if you are just buying the wheels, you can do that directly from the California company -- I think they are the ones who make the actual wheels and Tuggle gets the wheels from them to make the Cateez dollies.
New Concept Products · 5717 Sellger Drive · Norfolk, VA 23502 USA
Toll Free: 866-493-8726 · Local: 757-461-1122 · Fax: 757-461-0383
info@wetsco.netwww.newconceptproducts.com