I guess that's what happens when a sport becomes too big, too fast. Everyone jumps on the bandwagon and produces various products to make a quick buck.
I wish I could point you in the right direction as to where to get quality equipment, but I have little experience in buying martial arts equipment as far as names go. If I see something I can usually tell if it is quality.
One thing I can say, and you probably already know this, is stay away from superstores. They buy cheap stuff to sell it off more cheap. If I were you, try to find what you want and buy it over the internet. Even if you have to pay shipping, it may be worth not dealing with the hassle of finding a local seller.
don't be afraid to check out eBay. eBay search results for fairtex shin pads