This is probably the best nail polish supply store IN MISSISSAUGA. Check it.

One thing to note: they don't sell any Essie products. I'm not really sure why, but maybe it's 'cause they're so OPI-dedicated? In any case, I've always disliked Essie (with the exception of their base and top coats), so this place is my Xanadu. It's located at 3663 Mavis Road and you can see their hours over here.