Do you know where can I buy a cherry blossom tree in Toronto ?
Dear gardener, thank you for contacting the Toronto Master Gardeners.
I am assuming you are referring to a Flowering Japanese Cherry Tree (Prunus serrulata) which can be spectacular in the spring.
Unfortunately, Toronto Master Gardeners are not in the practice of suggesting vendors or services. Many of the larger Toronto area nurseries have websites with a plant search function which will show you the plants they carry, so a few minutes online may save you some phone calls. A look at the Landscape Ontario site can pinpoint the nurseries closest to you. Here is their website, https://landscapeontario.com/find-a-company (just click on the garden center tab).
Here is an informative Toronto Master Gardeners post that describes planting a cherry blossom tree and offers good advice: https://www.torontomastergardeners.ca/askagardener/planting-a-cherry-blossom-tree-in-my-front-lawn/