If you are looking for good deals on metals, here is an interesting place to check. Speedymetals.
com is an online store specialized in metals. Here you can find almost any metal you can imagine, including: Aluminium, Alloy, Brass, Copper, Bronze, Cold Roll, Hot Roll, Stainless and Tool Steels. They stock has more than 5.000 items and every metal is available in different sizes, grades and shapes like: angle, channel, flat, hexagon, plate, pipe, sheet and plate, and many more. On their website you can browse through their entire catalogue, searching by shape or product; every item has a detailed description, pictures, drawings, and prices. Up to now, they have more than 50.000 clients worldwide, since shipments go to any country and they accept all major credit cards. Another interesting thing is that there is no minimum order. For their products you can also check on ebay, where they are also auctioned. 
