Looking to purchase the wireless switch saw installed for a pull light. on the show.
How can we fix outlets that are not grounded with out tearing out the walls and how costly might it be.
Do and on-line search for wireless wall switches, you'll find several.
Depending on what you mean by " fix outlets that are not grounded".
If you mean to provide personal safety the easiest way is to replace the receptacle with a GFCI receptacle with a "NO Ground " label. If you mean to add a ground , you can run a bear grounded wire to the outlet. Grounding is primarily for lightening protection and noise reduction in some electronic equipment.