The HS15 plotter is no longer manufactured but is one of the better plotters GSP ever made. The software is two major upgrades out of date and would cost four figures to update. The Edge is 9 or more years old and the cost of a single repair to it, when needed, is so prohibitively high that it isn't worth doing and reduces its value to whatever you can get out of it until it needs a repair. The 18 cartridges of foil are worth around $900.
If I were in the market for the package, I would offer no more than $3500.