Check sold values on eBay. The Roland is worth around $300, the Casio about $500. If they’re in excellent condition complete with all original packaging and accessories, you can expect to get more for them.
I got a cz1000, same as 101 but full sized keys, about 15 years ago and still have it in a warehouse somewhere. It was ok for what I was doing then but I could never get a sound that didnt sound like it was from an early 80s video game. In fact I avoid patches that sound like that board.