If you live anywhere near the Bay Area in Northern CA., there are two retailers that will work with you on trades involving your ukes that are in "re-sale" condition - no junk. Music Works, 11225 San Pablo Ave., El Cerrito, CA., and Ukulele Source, 599 North 5th St., San Jose, CA. both have representative collections of good to fine ukes, and will help you if you are interested in a trade for a different size uke or a trade up. I have worked two trades with Duane at the Music Works, and just competed a trade with Smiley Kai at Ukulele Source last week. In deals involving a total of five ukes, I have ended up with a beautiful, Kanile'a tenor in satin finish that just sings. Retailers are in business to make a profit on every deal, but if you regard any loss on your part as "rent" you paid while enjoying your uke, and appreciate the convenience of no shipping hassle, payment risk, etc., trade with a reputable retailer may be for you too.