When using a monitor on a shoot, I noticed I tend to move it around quite a bit. So you could go for a decent rolling stand (like this), or you could try this inexpensive trick using Mini Furniture Dollies.
These little dollies are cheap, but because they aren't fixed to the stand you want to make sure you're using it on a fairly smooth surface. If you want to make them a bit more secure, you could screw on some cups (pvc end caps?) onto the dollies to keep the legs inserted. It's a great tip for moving around something like a director's monitor, but probably not something you want to use if your c-stand is elevated too high with a heavy object. But it's nice that these can pack up in my c-stand bag, and I can opt to throw them on depending on the location i'm setup at.