They were never common or cheap from my knowledge.
The first time I saw a Krag, was just over 60 years ago
The Marshall Wells store in Vernon BC had twenty, well used but serviceable Carbines in their rifle section.
Likely came in by the retailer management.
They were $20 each, which was expensive, compared to the Mausers/Enfields/Lee Enfields beside them at $12 each and in pristine condition. Ammo was hard to find as well. The chain only imported the rifles, no ammunition, surplus or commercial.
Later, Alan Lever imported a couple of hundred carbines and rifles that ranged in condition from good to excellent. The cheapest were $35 and went up to $75 for exc grade rifles. Most of the carbines had been FTRed and cut back in the process. The carbines had the most use.
The Krags were never as numerous and were only in first line service for a couple of decades at most. They were relegated to rear echelon service until the end of WWII, maybe a bit longer as training rifles or parade rifles.
There was a time, when you could purchase them as complete barreled actions to make up your own sporter, which was the flavor of the day back then.
Especially in the US, the Krags had quite a following and gunsmiths, as well as bubbas bought them up in quantity just to sporterize.