You overpaid. The genius of Crocs is that they have almost zero labor involved in making them. It's a shoe that's made via injection molding - essentially, you squirt foamed goo into a mold and bake until cured. I have a Dilbert squishy figure on my desk that costs less than a pair of Crocs, and it's made by the same process.
Any factory capable of doing automated injection molding can make Crocs - all they need is the right goo and a set of molds. In terms of production costs, there's no reason that Crocs should command standard footwear prices. Fashion and novelty were the only real price drivers.