Craigslist does have a for sale section that lists furniture as a choice. The furniture found there can be new or used depending upon who is listing it.
Your local consignment shop may have some used office furniture. You can also shop online for these items as well. Pawn shops and antique shops may even have some in stock.
With a little time and attention to quality it is possible to find anything. There are used furnitue stores, office closings and internet sources. You just have to remain aware of your requirements.
I'm sure you can find cheap office furniture on sites like Ebay or Craig's List. Lots of people sell their furniture on these sites and for very low reasonable prices.
No, used gym equipment is not available on Craig's List. You can find used gym equipment on other sites such as eBay and amazon for cheap prices. You are only able to buy normal sporting goods on...