I just bought the Mesa Boogie walkabout w/scout, and now I want to get rid of my Fender Bassman 200. It's only 8mo. old but didn't work well with my dble. bass. I was offered $300.00 for it but I'm not sure if I should hold out for more(I paid $620 for it). Does anyone have an idea as to what is a good sell price for this amp is?