depending on keg pricing anywhere from $20-135 just for the keg. then you have to weld the coupling in. I was quoted $75 for a hours worth of time. then the valve $15 and $4 for coupling. you need to cut the top off and make it look good. chillers go for $30_$50 depending on what the price of copper is doing.
if you're a handy DIY and think you can get a better deal then hold off, but if you think its work your time and money then go for it.
I picked up 2 kegs for $50. made a 100 mile drive to get them. cut the tops myself , and just soldered couplings in tonight so for me thats to expensive, but I know my skill level.
so for $90 you get a already made keggle and IC chiller its really up to you.