My recollection is that I paid $1700 for my 1970 CB750. But not all my synapses are firing these days. I bought mine in Sunnyvale, Ca. I ran into a fellow the other day who bought a new 1970 in Oakland, Ca and told me he paid $1300. Can't believe there'd be tat much difference in 50 miles, but maybe.
As i mentioned in my post, Here in indiana, in April 1971, I paid $1425 from the dealer i worked for, in Indianapolis, he usually sold them for $1725. But one could drive 50 miles east and get then for under $1400. So it was very much what the traffic would bear in the local area.
We were selling all we could get at $1725. The dealer in Greenfield was selling even more, where he got them was always a mystery, doing a statewide volume business. I think $1300 was close to cost, but that may have varied depending on volume.