In California, the thrift stores with multiple branches ( and major charities behind them) are Goodwill, Salvation Army, and St. Vincent de Paul. Don't know if any of these are present in Nevada, but could ask my son, since he lives there now (and I think his fiancee has always lived there). Of course there are also thrift stores with smaller organizations behind them, as well as privately owned second hand stores. But around here if you said Goodwill or St.Vincent's there would be no need for further explanation. Salvation Army, depending on the sentence in which it appears, might suggest one of the many other functions of that organization.