Superworms are pretty high in fat (compared to crickets, anyway), so you do want to go easy on them. Gutload them just like crickets. Common advise is that any one feeder shouldn't make up for more than 20% of your cham's diet, but unless you have good access to a variety of bugs, that can be hard to maintain.
I would keep the superworms to about 20% of the total diet, though, no more. I found I had to offer them randomly, rather than have a superworm "day" - my cham would hold out for superworms if he knew he would get them on every Friday, for example. Dust your superworms with calcium.
Most pet stores have superworms in a variety of sizes in little cups, and they are pretty cheap. I always open the cup before buying - nothing sucks more than getting home and finding a cup of dead worms... You should also be able to find Reptaworms or Calciworms (brand names for black soldier fly larva) - these are good feeders too.