What type of dress form are you looking for? I've seen both adjustable and standard at a store on Vanauley St (just off Queen st), I believe the name is Leather Town. I've also seen them at Fabric Land. I believe some stores can even order you one in if you ask.
As for Wig blocks I've never seen one, Hiscott is the only place that I can think of that has wig making supplies. You can try calling places like the Beauty Supply Outlet to see if they carry such things. I found this website online though: Link