How does somebody come up with a $699 price tag for a used gun?
Unless it is at a Gun Shop, $699 is an odd price to be paying for a used gun. Why not $700 or $675 ? Just about any rifle I heard of for sale on the aftermarket, is usually sold in $25 increments.. i.e. $625 or $650. $699 sounds like it could be retail book value. If that is the case, there is a whole lot of room for movement on the sellers part.
I think if it were me, I would be waiting to find one privately, which is where you can really save money.
Also, this is sort of the wrong time of year to let your desires run wild for something different.
Personally, I would not spend just under $700 for a used Ultra-Mag (too expensive to shoot). But I also think that in the not too distant future, used prices will be up there, or not less than 50% of new prices. So in the long run, maybe that price isn't too bad... who knows.