Tougher Dates Than Lists And Pricing Would Indicate?

For some of the "series"/grades of coins I collect, I have found that some dates (non-toned) are surprisingly less abundent and tougher to find than the lists, prices and rarity figures would seem to indicate. Here is my list of "strange toughies"! Anyone else find this anomoly as well?

$10 Indian Eagles: 1914-P in low UNC was harder to locate than I imagined. 14D's are abundent comparatively. Also, a lot of 1915-P's tend to look weird(strange toning look) so finding a "normal" looking one of those is a tad tough as well. I will say that a book I read on these did mention the 14P as more rare than commonly thought. I totally agree now!

5C MS67 Buffalos: 1938-D without major toning seems to be very tough to find. Considering how abundent they are it seems like 99% are toned pretty radically - golds and blues or purples mostly! They mostly have great luster tho compared to all other late buffs.

50C MS66 Late Walkers: 1946-P would seem like a pretty easy year to find a clean MS66 in, by price and rarity figures, but it took me a relatively long time to track down a nice well-struck one at a reasonable cost. Lots of other years/mm's like S's are "rarer", but a non-toned sharp-strike 46 was super hard to locate - without paying way above retail for it at least.