Visit this store:
[link|http://www.epcusa.com/|http://www.epcusa.com/]
Last time I was there, they had used UPSs. Get an APC one, they are quite good. Call them for directions, I think they are in St. Charles.
Also they seem to stock those twisty IDE and Floppy cables you were looking for. They had a whole bin of different cables at bargain rates.