Oilers are not scarce/rare, or expensive, at all. They show up on Ebay, Gunbroker, etc., also, many of the parts suppliers (such as S&S) listed on www.trapdoorcollector.com also handle Krag parts.
Brass muzzle covers are another matter entirely. Used (1980s) to see them all the time for $10/15 or so - now they are a $150 item - one of the most spectacular price increases of which I am aware, and it was sudden, too. The spring-steel carbine sight protector is even worse ($200) but they were always somewhat scarce so the increase was nowhere near as pronounced.
Brass muzzle covers are another matter entirely. Used (1980s) to see them all the time for $10/15 or so - now they are a $150 item - one of the most spectacular price increases of which I am aware, and it was sudden, too. The spring-steel carbine sight protector is even worse ($200) but they were always somewhat scarce so the increase was nowhere near as pronounced.

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