The commercial versions for Windows and Mac were not all "insanely expensive". Apple's MCL was sold for under $1000. Later the price was reduced even further. T

The commercial versions for Windows and Mac were not all "insanely expensive". Apple's MCL was sold for under $1000. Later the price was reduced even further. That's expensive, but far from a commercial UNIX workstation Lisp, which would be $4000 or more. On the PC there were also mid-priced offerings like Allegro CL, Golden Common Lisp, ... Still memory and early PCs were expensive. Like a good Compaq system or an Apple Mac IIfx / Quadra. A dev seat could easily cost $10k or much more with RAM, Disk, large screen.