Here's an example of what I was writing about. LL Bean Classic Oxford Cloth Shirt Click on the neck sizes and colors to see what limited arm lengths are available. (At least Bean still sells by measured length.) Back to the shortage aspect of the posted article...It would seem that something as basic as a button down oxford that they would have every size and color combination. I also seem to recall that the last time I bought a Bean button down it was about $20 less expensive, but I am not complaining about the price. The dollar isn't worth crap these days and that is not LL Bean's fault.
For not much more money you could go with a semi-custom shirt:
https://www.spierandmackay.com/fabric
Measurements can be specified to the quarter inch.