the ones this guy builds are comparable to the high dollar and top end Euroreef skimmers.
here is the part of the post about the skimmer, but the guy i know can build any size you want ...
6" diameter, 32" tall, Gen-X2400 pump designed as recirculating, fed with Maxijet 1200 (could also be fed directly from overflow) Also has a gate valve which is a 45.00 option with Euroreef skimmers. $125.00.
i will call him tomarrow and get the website that he sells them from and post it here for you. i would say that if you pick up the Euroreef version, it would run you about $450.00 !! but i can get these anytime you want one, but they won't be that cheap ... . i think he paid $325.00 to have it built.