Welcome! In addition to what @Charlie posted above, also include where you are located. A lot of stereo gear is pretty heavy, and shipping safely is somewhat complex and expensive (unless you happen to have the original boxes and all the packaging), so a local buyer (or someone willing to drive to you for a couple of hours) often is the easiest solution.
And check out escrow.com - it's a great, safe way for unknown buyers and sellers to do business.