There were 10 according to the builder. Sales I've seen over the last year have usually brought around $2200 - $2300. Worth more IMHO (I own OB #01), but the market determins the value unfortunately. I think the scarcity is the vary thing that has kept the value down, as if more people had the chance to experience one there'd be a higher demand, IMHO. Another factor is the OB is a very specifically voiced amp, so it will only appeals to those individuals looking for "that sound". The Atomica, and of course, the CCV are far more versatile and therefore have had a higher demand and why even fewer of them come up for sale. Just my .02 of course...