One that made locally and is used by most of the larger aquariums in the world is UMI, think its
www.umiindustries.com
Kari, is there other things that cost that you feel is a drawback for a chiller. I couldnt live without mine.
Also, keep an eye on the buy&sell, i purchased two one 1/2 hp, one 1/3 hp for $600.
Wendell