Salvation army isn't a non-profit in the strict traditional sense of the word, they are a church that happens to do a lot of worthwhile charity, The church part of their mission has led to some controversy regarding how they treat members of the LGBT community. While each individual office is different there's been a consistent thread of this running through the organization in line with their belief system. If that's not a concern to you then disregard, if it is you may want to consider how your donations and purchases are being spent.
As for finding thrift store items in general, you can find some great things in need of minor tlc, especially hand tools. I tend to use my battery powered told for most things these days that are have tools so plugged tools aren't my forte but I still have a drill I bought ages ago that's lasted me numerous projects and years without failing. It's kind of remarkable how well built some tools are.