I got a lot of my stuff from the dollar store.
Ammonia, plastic sheeting and plastic containers. Plastic sheeting to wrap mattress
in. Change once a week. Ammonia, borax and Dr. Bronners peppermint soap (a little goes a long way) for bathing in. Boiling or steam ironing clothes,sheets and towels. I rarely get bit or crawled on anymore except for my feet. It takes time. These things are very resilient. Don't waste money buying a lot of stuff.