I ran across these the other day as well. For some reason, I am seeing the Darimo ix2 as being diffferent across the range, but includes the hardware vs. Odin Zeus not including the hardware in their weights. so the Darimo stuff ends up being quite a bit lighter.
FWIW, weighed without hardware my 100mm -17 deg Kalloy Uno stem weighs 82g vs. 73g for the Odin Zeus. As others mentioned the Kalloy stems are 17.50USD + shipping and tax. You can then spend $12 on Ti hardware and be likely be within 5-6g of the whole thing for 1/3rd the cost.