I did not buy any I ended finding some I could use for the day. The company that I planned on buying from was International Steel & Counterweights. The website is www.steelcounterweights.com. They were the cheapest and the easiest to deal with. Got me a quote for the carts and once I gave them a delivery address they sent out a new quote with the price for each cart with delivery.

If you find anywhere else that isn't asking for the gold fillings in my teeth for some steel on wheels pm me and let me know. I'm going to have to order some in the near future.