I think that this gentleman has a good deal on a
new rotary vise.
JWTrout
The vise is a Griffin Odyssey Spider for $67.80. Your total cost, shipped, would be $76.75.
If you can do better, please go for it.
I bought my Griffin Vise from John over 8 years ago and it's still going strong. Have replaced an o-ring on it and added a rotating arm to it. My model is a Griffin Superior 3ARP. It's my favorite vise (Yes, I do like it somewhat better than my Dyna-King).
If you decide to attempt to buy used, be sure to see photographs of the vise jaws. Photos should show the jaws inside and out. Look for grooves where there shouldn't be any and chips to machine-grooved areas in the jaws. Chips to the outer jaws shouldn't affect performance, but if you care somewhat about aesthetics...