I bought mine a a local industrial supply store. They sell stuff like safety equipment and they also had chains. I have 5/8" x 5' and a pair of 9/16" chains. They came out of their scrap chain bucket and I paid by the pound. I also have some 3/8" chain that is certified to 7500lbs that I use to suspend the bar from my power rack. That stuff was a bit pricey.