Thanks Davet, that might work (although the descriptor says converts 120 to 12v, I need 12v to 120), the plugs look like they would work.
I did search again, and found a few 120v options, but the reviews were so horrible, I didn't take the chance. On the several models I found, there were too many "worked for a few days, junk, etc." type reviews. That was in the $50 range. Moving up, you can spend $300 or so for a heat/massage chair. I don't need the massage nor want to spend that amount of money. I'll continue to look.