Guy, I bought most of my aluminum from the link below. He has an ever changing stock and will work with you on what you need through email. He also lists auctions on e-bay from which I have gotten some really good prices. One time I got 5-4 ft. pieces of 1 X 1 X 1/8 square tube for $27 plus shipping. I was in no rush so over a period of a few weeks and checking ebay daily I was able to save a few bucks. He will also combine multiple buys into one shipment to save you a few bucks.
https://stores.shop.ebay.com/TRINITY-METAL-SALES__W0QQ_armrsZ1QQ_fsubZ0QQ_sasiZ1
