Gun case foam?
 

Anyone have an idea as to where to get the high density foam used to custom line gun cases? Preferably local to the GTA, I'd order online but I don't exactly know what I'm looking for and I'd prefer not to have to wait to order it

I'm not sure about the GTA region as I'm on the other side of the country, but look into custom upholstery, cushion, mattress shops.

Those shops deal w/ custom cut foam all the time and will generally do custom orders and cut foam inserts for you, or sell the foam on its own.

Quick google showed a place called "Foamite" in the GTA region.

I ordered mine via foambymail.com. They have a Canadian site if that's not it.