Used pool tables are frequently available. Keep an eye on your local classified section for moving sales, yard sales, estate sales, and so on. You’re sure to run across something eventually.
When shopping for used pool tables, ask all the same questions you would if you were buying a new pool table. What size is it: 7, 8, or 9 feet? What are the body, bed, and cloth made out of?
If the body is made out of more than one piece of solid wood or other material, check the connections for wear and tear. How sturdy is the table? Crawl underneath the table and have a look, as if you were a car mechanic. Stand next to the table and give a shake or two, back and forth, and side to side. Bring a carpentry level with you. Set the table on even ground (as gauged with the level) and test the bed with the level.