Website for a info commercial that has a flush cutting tool for remodeling, carpenters help!?

A company advertises in their info commercial for a hand held tool that will cut thru countertops up to 3/4 in thick, and countless other materials. It costs around $200. It looks like a straight edge with a angle towards the end. I believe it uses a vibration motion rathar than a circular motion. My son is remodeling a house and needs to cut thru plaster and lathe. He needs to be able to cut right up to the woodwork and then will replace with insulation and drywall. I watched a info commercial that had a tool that flush cut materials but I don't remember the name of the company or the name of the tool. Does anybody know the name of this tool? Or know a tool that has a cutting blade that can flush cut right next to woodwork ?