I trust that in Scarborough Ontario it is the same as UK... ILLEGAL to dig any wild flower up from the wild.
A good guide to plant conservation world wide is...
"TAKE ONLY MEMORIES, LEAVE ONLY FOOTSTEPS"
Long Acre Plants in Wiltshire sell Trilliums.
Also many other shade loving specialities.
They do mail order.
All plants are grown on the nursery, they are strong healthy plants.
They grow all Trilliums from seed .
From seed to flowering takes years, so no Trillium is ever cheap.