My local music shop has a 1924 Conn New Wonder Alto for sale. But, I'm not entirely sure how much these are worth. Additionally, My local music shop has a pretty bad reputation and is known for selling overpriced low quality instruments to unsuspecting parents, yet it's the only shop in the area. So, I really don't trust them. The price they want is $999 which I think is a bit overpriced. After a little research, I've seen the prices range from $300 to $1500. So, what are these currently worth?