should cost about $300 for 1000 feet
I use eastern metal but they do not carry 5/8" aluminum angle, just 1/2 and 3/4"
1000 ft of 5/8" angle would be about 100 pounds.
Since canada is a huge country and we have no idea where you are at you can probably just order it from anywhere and get it shipped, it's not that heavy.
Aluminum currently sells for about $2 a lb whole sale, so figgure $200 for the material.
buy a $10 wire brush for your bench grinder and have at it.
Coat with a clear paint like
http://www.wholesalemarine.com/blog/2010/05/17/toon-brite-protective-clear-coat-faq/
about $100 for a gallon
it's not as durable as anodized aluminum but looks good and is easy to apply. but it stinks to high heaven