This kind of goes with Amazon, eBay and Craigslist selling but dumpster diving is a good source of products to sell. I have found a few dumpsters in my area that regularly throw out valuable items I sell on one of the previously mentioned sites. My first week I found a large box of brand new toner bottles that cost $2400 on Amazon. I sold them for nearly $18oo individually over the couse of a month. Printing companies are good sources. I have gotten multiple printers, some working and some not but these are not $100 Walmart printers so even broken they can sell for enough to make it worth it or you can part it out too.