Right on greg!!!
Toad here in Quebec the law said 10 Sirtalis sirtalis maximum including sirtalis pallidulus...but i know whatever is the subspecies don't exceed 10 thamnophis...the law is not the same in your city ,in your province..look your local laws.One thing for sure its illegal to sell thamnophis sirtalis sirtalis here in Quebec i think all over Canada!

but I dont think its a good idea to pick up 10 garter from the wild...
catch young age or year born garter snake if you can...never adult or gravid specimen especially if you begin in the garter snake world....Death rate are over 90% more 95%on year born baby for many reasons.That why adult are so important Next generation depend on adult snake.I prefer you to make a deal with me.

I will have babies eastern garter snake with nice colour .my female is gravid I expect over 30 babies in 2 months maximum....I think I can affort to give you Nice coloring gartersnake if you are wellin to pay the shipping...