Archer's Plastics in Port Moody. No cheap way of getting acrylics besides used, acrylics is 2-3x the cost of a glass tank new. In order to price acrylic tanks "cheaper", they have to make enough tanks to maximize the use of acrylic sheets. Unfortunately, we don't have a local company who does that.
I have done a fair amount of research in the past couple weeks or so as I am in the market for a 240+ gallon acrylic tank. For me, quality is a must. Once its in my house, it not moving again (unless I get out of the hobby) and I don't want it to ever fail. Used acrylic tank is a gamble like anything used, although very small percentage of it failing if you know what to look for. Joint failure was my biggest concern but with the size I am looking to get, I am willing to pay for a peace of mind.
Good luck!