There are lots of Montmorency Tart Cherry on Mahaleb roots available. Give Matt a call if you are looking for 1000 or more trees for Spring 2019 as there may be deals to be had. Possibly for 2020 also.
If you are planning Montmorency plantings for 2021 or after, what I predict we will see is a vast shortage of Montmorency trees as the nurseries will be cutting back on production plans for those years.
We all know that the Montmorency cherry market has its periodic ups and downs, and while we are in a down cycle right now, if it is a crop that is important to your farm you know that you have to keep viable orchards going and be on a regular re-planting cycle. Spring 2019 and maybe 2020 may be the years to get replanted at a savings.