Robi-comb.
Costs about 30 dollars. It is reusable, can be taken apart and cleaned if you want. It is basically a mildly electrified lice comb. It is chemical free. I had my kids cover their ears when using it, ears are quite sensitive.
Otherwise I tried it out on various parts of my own body first, it generally produces a mild tingle, if anything. Then just wash the bedding twice a few days apart.