What's a good price for a set of these? Does anybody know where there is a set for sale?

If you're lucky you can find a set of TaurusIIs for $700 up which, if you're considering these, you'd come out cheaper if you bought a Rogue (~$350).
The original Taurus and the T1s sound much better and are priced higher, around $1200. All pop up frequently in the classifieds and Big City Music usually has some of them in inventory. Also, be sure to check your e-mail.