Thinking about ordering a set of blades for my 48" walker from J-Thomas. A set comes to $25 and some change. My local dealer wants $25 a blade. My question for you guys is, are there any differences that you know of between the blades from Thomas and the blades from my dealer? It seems a little weird to me that I can get a full set for the same price as a single blade. Makes me kind of uneasy based on the potential quality from the online store.