When you need some metal....

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Alro is a great resource. I know around Southern Michigan and Indiana, there is an 80/20 provider, and if you purchase through Alro, I believe it is around 20% discount compared to directly buying from 80/20. I do a lot of welding besides robotics, and I've always purchased from Alro. For robotics we mainly use McMaster but we may be moving our build site to a sponsor that uses Alro commonly so we would probably order with them since shipping is next to nothing, they already deliver to the building, and material comes in longer lengths.
Highly recommend Alro.