@ridicawu makes an excellent point. In addition to thrift stores, keep your eyes on the curb. Often, when a tenant is evicted, or, for some other reason, must suddenly move, a large pile of serviceable cookware (among other items like furniture) will appear on the curb. Some are going to say it would be dirty, but in all honesty, we all know you’d wash the stuff from the thrift store as well, so what is the difference? Preventing the manufacture of more cookware and directly preventing those items from ending up in a landfill is very eco-friendly.