Here is the URL to an "independent review" citing a cost of about $67/sq ft. If you got an in-home consultation for this product you may find it near or more than the cost of slab granite.
You might consider updating the hardware on your cabinetry. It's hard to say without seeing your kitchen...
Good luck with the sale of your home - hopefully you can do what it takes to make it a competitive offering!
I'm sure there are other companies that do the same thing.