Classifieds.org is an online marketplace filled with ads for big ticket items, antiques, and all the other stuff you’re looking for! It mainly serves the United States, and here you can browse by category, major cities, and by price range. It acts as an aggregator of many different things all over the net (from places like craigslist, Google, and more) into a single place with a great design so you can find what you need when you need it. Another handy thing to check out is their community where you can find things you didn’t know you were looking for.