Going to Portugal vs Croatia need advise

heading to my first world cup game and its Portugal vs Croatia in Toronto on July 2.

I really want to make this experience memorable and I want to collect match day merch you aren't able to get anywhere else.

Does anybody have any tips on how to secure merch while stock is available, im sure this game is gonna be the most crowded yet. Also, where do I go to find the main FIFA stores, I don't want to waste time accidentally waiting in the wrong lines

Also any other cool memorable things that are a must let me know

Thanks guys!