Hello where can I buy them in the Toronto downtown area?
For information on where to purchase agapanthus, please visit Landscape Ontario at https://landscapeontario.com/garden-centres/43.516700744629/-79.88330078125 and select the garden centres closest to you.
This plant (or rhizomes) is usually available at large, well stocked centres that are know for having unusual container plants.
There are two types of agapanthus: deciduous and evergreen. The overwintering procedures differ.
If your agapanthus keeps its leaves after the summer, it is probably an evergreen. If the leaves die back, your agapanthus is deciduous. If you don’t know which you have, it may make the most sense to treat it as an evergreen, and you may be pleasantly surprised. Here is an entertaining blog post from someone who did just that: https://fiestafarms.ca/4441/garden/agapanthus-lily-of-the-nile
Some good specific instructions for overwintering are found in this Toronto Master Gardeners response to a similar question, which notes that the most common hybrids available in the Toronto area are evergreen agapanthus, cultivars of A. praecox and A. africanus: https://www.torontomastergardeners.ca/askagardener/are-agapanthus-winter-hardy/
Good luck growing this beautiful plant!