Not just difficult, but 'very' difficult to acquire and very pricy as well, that is if you can find them first. Those are BlackGate NX Hi-Q 22uF, 6.3V in the LOD. The production has stopped years ago and most of the place that used to stock them already run dry. I bought them from Part Connexion at US$2.25 each about a year and a half ago, which too has no more stock on the 22uF NX Hi-Q. The smallest NX series that they do have is the 470uF, which is $14 each now. You can imagine how much the rarer NX Hi-Q 22uF can cost these days. Do take care of that LOD as I don't think there will be a lot more LOD with that cap in the future.
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...Those capacitors are very difficult to acquire here..