At least here Stihl has clamped down
a lot on pricing.
Usually they have two promotional sales per year, one in the Spring and the other in the Fall: originally they were only on homeowner grade equipment but starting in 2018 it was extended to some high volume pro-grade stuff as well (BR600, MS261C-M etc). Don't expect said promotional sales to include top of the line stuff such as the MS462 or the big brushcutters though.
Up to the end of 2016 high volume Stihl dealerships (the US is under a different country management than ours so it may be different) could sell a limited number of pro-grade items at a discount, especially at the end of the fiscal year, but to the best of my knowledge that particular window has been progressively closed.
Funny thing is last time I was at the Echo dealer they told me Yamabiko (Echo + Shindaiwa) is progressively moving to a pricing structure similar to Stihl's. Again this may be a country management thing, but one thing is sure: Yamabiko hiked list prices so much they are now exactly the same as Stihl.