You mght want to try eBay.

First, however, go to eBay.com and do a search for what you're selling. This will give you an idea of what people are asking for similar istruments.
Next, go to the left hand column and click on "completed." This wil tell you what people have actualy paid for same.

If this shows that you can sell your instrunents for what you want, you need to register. You will need a credit card number et al. In the old days eBay would bill you, but the volume they work in precludes this amenity.

If you choose this route, I will be happy to help you with the listing details. You can contact me at: tomhall7@yahoo.com.