Just buy Pallet Racking.
I bought used sections for above scrap price. The odd size uprights are the cheapest since the companies have a hard time selling them. My uprights are 44" deep and 9' and 12' tall. The industry standard is 48" so the recycler of Pallet racking was kinda happy to get rid of the odd size stuff. I also found some 28" deep for a friend who has a smaller shop.
It it has been the best investment I have made.
I'm going to build some 25 feet long 12feet tall and 2 feet deep shelves so I'll get all the stuff piled really high and out of the way .
I bought used sections for above scrap price. The odd size uprights are the cheapest since the companies have a hard time selling them. My uprights are 44" deep and 9' and 12' tall. The industry standard is 48" so the recycler of Pallet racking was kinda happy to get rid of the odd size stuff. I also found some 28" deep for a friend who has a smaller shop.
It it has been the best investment I have made.