Are you partial to eBay?
I personally believe if you choose wisely, you can find shoes that show very little wear or none, and get it for 20 dollars or under off eBay, and that's the only place where I buy my shoes for cosplay.
For example: http://www.ebay.com/sch/Boots-/53557...+boot s&rt=nc
Sorry for the long link. x___X That would be a refined search for black boots. I know Chrome has a buckle on the top of hers, and I would most certainly take a couple of those if I were to cosplay Chrome.