I'm sure there is a gazillion ways to do this better than I did, and even I most likely got the compound I was after with reasonable yield. And no, EDTA is not cheap, in fact it is about twice as expensive and not nearly as available as Na2-EDTA. And yes, making EDTA is only the first tricky step towards NH4-Fe[SUP]III[/SUB]-EDTA, and the FeBr3 needed to get there is also hard to obtain.