There should be a welding supply/store in your area. Call them and ask where to go for metal. Since welding and metal go hand n' hand they should know a good place nearby.
Or just look in the phone book for a metal supply or fabrication & welder supply. Or anything like that. One brand name is National Welders so look for that. Ummm... I'd stay away from any BIg Box store when buying metal. YOu can get a piece of 4foot flat stock for like 3bucks at a metal shop. At Tractor supply that same metal would be like 20 bucks! I'm not kidding, Lowe's, any of them! It is worth your money to spend the time to find the real metal supply in your town.
Make sure to not get Aluminum Diamond plate, that is too soft for rocker protection. You may already know that, so sorry if I'm sounding like i'm talking down to you.
for my rockers, i went to a local sheet metal shop and had them make me some out of 304 stainless. they ran the stainless through a timesaver to give it a brushed look. looks great!
for your metal needs, it really pays to shop around! big mark ups in steel.
I guess I am lucky because we've got a steel manufacturer here in Tyler. Steel is very cheap when you buy it from the right place. If there is no place near that produces the steel, then start with the larger fab shops. Also, if you take whatever lenght that they have, you will save yourself the $$ for cutting it. 20 and 24 feet lengths are common.
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