American Metals yard on Broadway in Mesa, AZ. They buy s**** metal of all kinds and sell new steel as well. They have s**** stuff at the door to the new steel sales office where the pieces are normally $0.45 a pound, but are on sale now for $0.35 a pound. If I need longer pieces I look in the remnants stack for what I need. A piece cut from a remnant is cheaper than from a full 20 ft. stick. I usually check the s**** rack and the remnant stack once a week. I keep a list of the steel I need for different projects and if they have an item on the list, I get it. A couple of weeks ago they had a 12" x 18" x 1/2" thick piece of plate which is just the right size for the disk sander I'm making from av8's old American Rodder article. $0.35 a pound is cheap. I usually have several project on the list for which to buy.
i got hold of 2 steel entrance doors from a building rehab 18ga 4 sheets 31x74 i cut them open about a 1/2 inch away from the edge there is bracing and styra foam inside good saw or cut off wheel works 1st one was a test they do have other gauge metal i think 16 and 14 there is a tag on the door frame
onlinemetals.com for all the detail stuff, any size or shape you need, never felt ripped off, after you place an order they send you a coupon for your next order, 10% off