There are cheaper alternatives to the Canon flagship speedlites when it comes to the Master function, for instance the Nissin Di 866 mk II or the Meike MK-580 both have master trigger functionality. Personally, I trigger my Yongnuo flashguns with the Meike MK-580 and it works extremely well, especially for a flash with similar power output to the Canon 430 EX II (GN of 42 @ 105mm), plus it only cost €145 (about $170) and it is practically indistinguishable in appearance to the 580 EX II.