Sigma Acoustic Guitar Values

WFM Search Mitchell estimated and Sigma guitars?
I have a WFM Mitchell MD 400 acoustic guitar and a Sigma DM-1. Does anyone have any value or resource esimated Online?
Yes, based on the 2007 Blue Book of Acoustic Guitars, two brands that use the name of Mitchell. One of them is a instrument imported sold to a level $ 100 to $ 300, so that the market uses very little pay. NEW wholesale prices of these guitars can be as little as $ 25.00. The other is Bil Mitchell of Pennsylvania. These are handmade and of very high quality. Bil sells these for about $ 3500 depending on model. Sigma guitars are imported line Martins and have become, on and off for 30 years. The prices are not usually sensitive to year. Original retail pricing for the DM-1 landed about $ 335.00, and now have a value of between $ 80 and $ 250. version superior sound to go a little further. If you trade for guitars in hopes to raise between 50% and 75% of current value. Outright sale to a store to buy gear used will net you a 35% to 50% of actual value.