Actually, I fondled many copies of the "ST Starfleet Technical Manual" in shops for months (1980) before deciding I really, really needed it. I have a feeling it was at least $19.99 way back then; very, very expensive for the day. It was the price that put me off each time. When I found a good condition, remaindered* copy of Bjo's "ST Concordance", I celebrated that bargain by buying FJ's manual, and then the blueprints. (* Not realising that authors received no royalty on remaindered books.)
I only ever saw the "ST Starfleet Medical Reference Manual" in one shop, and after eight long months of looking, I special-ordered one direct from the distributor. I had to pay on the advance invoice before they'd sent it out and, at first, they billed me for ten copies. Imagine my face when I saw the total. They thought I was a bookshop, but I was using my Dad's bread shop as a mailing address.