I paid $150 for a sweet red + white mid 70s one here in the pricey SF Bay Area, and have seen plenty of others for around the same price. On CL they often ask $200, but I figure no one pays full price on CL. I also got a Gran Sport - same frame, but the fork is 531 also - for $150. Gran Sports seem to go cheaper than SuperCourses, even though they are a step up.
THose both were with their Brooks intact.