Monsterjanitorial.com probably carries it because they have an MSDS page listed for it at:
Contact them at:
Iowa State U probably uses it because they have it listed in their Central Stores at:
Their Central Stores page says they can't sell to anyone other than Iowa State Agencies, but they might be able to direct you to THEIR supplier. ISU's Central Stores home page:
You'll find a whole host of folks to contact in their Central Stores at:
Good luck! I know what it's like to have a favorite hard-to-get item!