Selling or Trading in a Cello to a Music Store
One of the easiest ways to sell a cello is to take it to a music shop that specializes in string instruments. Since music shops sell cellos frequently, they are likely to buy your cello for a fair price.
When you go to a music shop, make sure that you bring your written appraisal or have a price in mind at which you would like to sell the cello. This way you have a baseline for negotiating the selling price of your cello.
Negotiating is key. Music shops are very willing to negotiate with you on price, especially if you act respectfully to them or are a great customer. Read some articles and blogs about negotiating before you go. Lifehacker has a great article on how to negotiate anything.
Another way to negotiate the sale of your cello is to ask for a trade-in. If you are looking for a larger or higher-quality cello, trading it in can get you a better selling price. Just like when you are trading in a used car, music shops are much more willing to give you a higher price if they have a guaranteed sale of the more expensive instrument.