Any W113 enthusiasts care to comment on the value of a 280SL?

Given the following, in general, what would one expect to pay?

Complete or nearly complete
running
driveable
with 5-speed
both tops or no tops at all
project car

I have completed comprehensive restoration work on three W109s in addition to a 112. I am familiar with what to expect in terms of where the funds go. I am looking for a range of sound numbers with respect to the initial cost of my next project.

Additionally, if you know the whereabouts of such a 280SL I'd love to hear about it. Please PM me.

Thanks, for the insight.