Inexpensive furniture options?

Any suggestions for good quality inexpensive Furniture/home furnishing options?

I am getting a new home soon and looking for suggestion. Costco or any other big retail place will have stuff like sectionals for $1600+.

Any tips/tricks or secrets to get these for way less? Used? Auction? But clean. Don’t want to get bugs or anything in with the furniture 😂.

Feel free to dm recommendations.