Impact Thrift Store in Lansdale, Pa is opened only a few years ago and it already has a huge customer base. The store is located convienently on Main street and has entrances in the front and back of the store. Whatever you are looking for, you can most likely find it there - furniture, clothing, home supplies, electronics, books, etc. The store is large and pretty easy to walk through. Usually there are some nice quality items for you to pick from, but you have to be quick! Things such as couches and bureaus can move in and out within a day.
Another nice thing about the store is that they donate to local charity. I'm not sure of the specifics, but I believe a majority of their profits go to helping local homeless shelters.