I recall stuff like the Intel icc compiler being expensive and desirable, and things like client access licenses, hardware licenses (to allow using non-trivial amounts of RAM and multi-processing) and support plans for proprietary OSes being rather expensive. Consulting a SCO Unix price sheet from that era, a license that allowed 150 users and up to 32GB of RAM was $10k.

Prices also varied around OS features used. Vendors loved to nickel-and-dime you (separate *-user client licenses for file services, print services, remote access, etc), generally to drive you towards bigger packages that seemed like a better deal.