Your part of the country seems to get some of the best gear and prices at thrifts. Was in Boulder GW last week, saw a set of Dynaco separates amp which weighed a ton and matching FM receiver. Price: $20 for both. Would have bought, but had no way to carry home to NE by plane, and shipping would have been prohibitive. That was just the most memorable of my encounters with vintage gear during my visit there, and I only hit 3 thrifts and never got to any in metro Denver. I did come home with a stack of good vinyl in excellent condition (lower humidity must be good for vinyl there).
Happy hunting!