OS/2 1, the 286 version, was quite expensive enterprise software. I evaluated 1.0 in my first job.
OS/2 2, the 386 version, was relatively cheap. I paid about £40 for a copy, and it's one of the very few pieces of x86 PC software I've ever bought in my life.
OS/2 3 "Warp" did have a free evaluation version, and was distributed on magazine cover disks. However it took much of a CD and was not readily available on floppies.
Surely not in early 90's Portugal, where OS/2 was only available in IBM PS/2 PC with MCA architecture, with a tax of additional 500 € (more than one month salary minimum wage) versus the 386SX/DX OEM PCs.
Might have been the case, but on my small town buying such IBM model was the only way to get OS/2.
No one was selling it on OEM clones, and buying a PC clone was already expensive enough, to even think about trying to get an additional alternative OS at IBM prices.
I remember testing the networking component of a game by running two simultaneous Windows 3.1 sessions, and fuzz testing DOS apps in multiple VMs (using DPMI, even!)
As I recall, IBM would send you OS/2 for free, on a bunch of the new-style 3.5" floppies. I think it was about two dozen floppies.