I'm probably in a minority, but I try to avoid Ebay as much as possible. Amazon is my go-to place for just about everything: 2½" sq x 4 ft 6061 mill finish is $38.37 and free shipping (assuming that would worked for your project).
Amazon Al
Besides avoiding Ebay, I almost never pay shipping. Amazon, in my experience over the years, has been a breeze to work with, and stands behind everything I buy. My experiences with Ebay are just the opposite, particularly when dealing with a couple of illegal transactions. Just my 2¢, of course, and no offence to any Ebay sellers here.
Amazon Al
Besides avoiding Ebay, I almost never pay shipping. Amazon, in my experience over the years, has been a breeze to work with, and stands behind everything I buy. My experiences with Ebay are just the opposite, particularly when dealing with a couple of illegal transactions. Just my 2¢, of course, and no offence to any Ebay sellers here.