I got the compact reef 100gpd RO/DI for $149 plus shipping. Installed 2 weeks ago. Plumbing was a snap, great pics and directions. Should take about 15min to drop in. Just be aware of 2 things: 1) Good water to bad water ration is about 1:4.
2) Temp of cold water; as temp decreases so does production. The formula is for every degree in temp drop from 72 is a 1.6% loss of production. So a 100gpd is based on 72 temp. My water temp right now is 56 degrees so my loss is 28gpd.