The best place to buy used musical instruments is at a neighborhood Pawn Shop. I suggest this because musical instruments are quite delicate and what looks good in a photo may not be so in person. At least, at a Pawn Shop you can check the merchandise out.
Some pawn shops even offer a limited warranty on the items they sell, so you want to look into this before you decide to buy. Another reputable place to purchase used instruments is Guitar Center: guitarcenter.com. They have a used instrument section: used.guitarcenter.com/usedGear/index.cfm... can either purchase online or find the used items that are in the store of your choice.
Another website you can try is Musicians Buyline: musiciansbuyline.com. There are hundreds of listings on this site. If you have knowledge of your instrument and what you are looking for, you will be able to determine the quality of the item that you are interested in purchasing.
After finding something that interests you I would ask if there is any sort of warranty period they can offer.
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