I thought the 9440A was in the price range of $2,900 to $3,200 in 1975.
I know of an Altec dealer who still has a NOS 9440A on his shelf with the original price tag, showing $3,000 and some change. At least last time I saw it about 3+ years ago.
He didn't want to sell it either.
A lot of hotels used the amps back then also.

Steve