Looks like a MechPro... not sure where to find one in the US:
http://repcoequipment.businesscatalyst.com/light-garage/jacks/mechpro-engine-stand-450kg
Summit has some decent 4 leg stands:
http://www.summitracing.com/search/part-type/engine-stands/leg-style/four
You've done a fantastic job on your shop, Andybull! I really like that you left the floor it's natural color... what have you coated it with, and what do you use on it to clean it?