Ebay, Kury, and all the mcy. catalogs have them, but you probably don't want to wait for shipping. Two places I remember local to you are Fastenal on E.G. Blvd, and Daytona Nut & Bolt on Aurora Rd. Worth a look, IF they are still in business.
I made mine, and only messed one up by crooked drilling. Grade 5 is strong enough, and drillable.