I have joined the site below. Although I am in the UK they welcome anybody from anywhere around the world. Top site for pics, members photo`s and any advice you may need.
It is run by professional ppl who bread & sell discus throughtout the uk
www.ukdiscus.co.uk
LINK...
Why not try a local glazing company or glass merchants. They would be able to cut glass to size & sand the edges for you. Just remember to ask for toughened glass & you would prob need 8/10mm thick.
There are loads of forums on building a tank and you would be surprised how easy it is or you...