$100 for a bank of 4 is a pretty good price. I have about 40 of these, they are handy. I'm planning on replacing them with Vidmars when the opportunity crops up, so they will be for sale eventually. eventually....
I have lost out on several sets in auctions by being too cheap for my own good. A set of four bins, with cabinet/sliders, not counting any contents, seems to go for $100 to $125 around here.