(Question)
Where can I purchase a corkscrew willow tree in the GTA?
(Answer)
The corkscrew willow tree (Salix matsudana) is also known as the curly willow. This tree grows well on almost all soils in full sun.
https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c145
For information on where to purchase the items you are requesting, please visit Landscape Ontario at: https://landscapeontario.com/find-a-company
Click on Garden Centres and write your postal code, you will have a list. Before going there however, I recommend you to call them to know if they have Salix matsudana.
Good luck!