We are the neoprene fabric manufacturer from Dongguan China. We always make our neoprene fabric based on the clients requirement such as the thickness the color. Actually 3 mm thickness neoprene in black color which is the common neoprene for most factory and is in stock. So if you want small quantity 3mm black neoprene can buy it from the factory. If you want other colors that will always need to be customized so that will better buy it on Ebay or Amazon so you can find the color you want and which are in stock also.
And of course if you want the big quantity such as over 30 pcs that will be much cheaper buy it from the factory than others.