All depends on the model, size and condition.
A quick look at Ebay will tell you what the asking price ranges are. There are always a lot of them on there. However, shipping is costly, so i am sure many do not sell due to that fact.
I would say that any decent sized model that is in good conditon is worth between $75 and $100. Smaller models can be had for $30-$60 usually.
And larger models can sell for as much as $200.
I cannot say there is much of a collector market for just the vises. It is more of a crossover interest from the shotguns. So, the smaller to medium sized models are more popular among Parker collectors.
