Based on google - Crystal Glass should work for you in Richmond.
You could always try to find some plate glass for free on craigslist and buy a glass cutter and tempt fate by doing it on your own its fairly easy.
Look on craigslist, get free glass and try to cut it yourself. It's easy. Piece of glass from art frame is just one example.
I don't have too much experience, but if the glass is free, bring it over and we'll learn together.
New glass is soft and easy to cut. Older, is more brittle, I find, and sometimes it won't cut exactly where you want.
Thanks for this thread and discussion ... I had some specific tank ideas to take maximum use of my fish room and was thinking of a DIY build. I thought I'd contact Concept Aquariums first. They were more than helpful. They quoted a great price and said the easiest way for me to go would be to order through King Ed's as they deal with them all the time and would be able to ship to them. This makes it easier for me and pretty easy pick-up as well.
I, too, bought from Crystal Glass (in Chilliwack). I do not know if all these stores are connected, but the service I received in Chilliwack was top-notch. Done same-day. $6 for one piece on a 10-gallon tank. I gave the man $10 because the quality and service were certainly worth the price.