lailokenI'm fairly sure it is a CIY. There was the 87 key and 104 key that accounted for the price difference. I own two of these. They are very easy to mod for a removable USB cable, sound dampening, adding weight. The only thing I have struggled with is finding SMD LEDs that are low power enough and still bright enough. The resistors are too small for me to try and replace.
lailokenI just received mine from Amazon for $50 (with blue switches). It is a CIY one as well. I might have bought the last one at that price however.