I agree. I just bought an Air Water Ice Compact Reefkeeper for $139 plus shipping. It is actually not as "compact" as it sounds...it's a good sized 5-stage, 75 GPD unit. It works great.
I have an Aqua Safe RO/DI unit--100gpd --that I am extremely happy with. I paid under $100.00 with the TDS unit it cost me $139.00 with shipping. I bought it at the well known large auction house. E..... You should check it out. Their prices on the membranes are very reasonable.