Depending on the barrel length and condition, it could be a good deal or a great deal.
If the gun is minty with box, $700 nowadays is below market on any and all barrel lengths.
The 5 inch barrel is extremely tough to find and the most expensive.
The 4 incher is tough to find and they are very pricey.
The 6 incher is the most common and probably changes hands for the same price as the 8 inch tubed model.
The snake prices have just been climbing since they are no longer being made.
I don't see them dropping anytime soon either.
Good luck, Jeff (GUNKWAZY)