Platform boots, corsets, stockings, gas masks, goggles, etc.
Looking for some suggestions for sites (in the United States only, please), that are on the inexpensive side, as far as goth/industrial/cyber-punk and club wear goes. Thanks.

Honestly ebay may be the best choice. That's where I've got a lot of my stuff and it tends to be a lot cheaper than goth specific websites. I've gotten new with tag corsets for like half the price the tag has said and I've bought a new pair of Doc Martens for 40-something dollars (probably so cheap because it had a scuff on one boot, but it was barely noticeable), which was much cheaper than the previous pair I bought for like $100. So if you look there's some good deals and also I've found there's usually a good selection too.