RO Units

Does anyone have a great suggestion on where to get a mid to small size 
RO unit?  Where do you find the best prices on these babies??  I am 
tired of hauling water from work (where we have DI water on tap (yeah) 
up two flights of stairs and getting weird looks from the neighbors.  I 
have three tanks (a total of 95 gallons and all have open tops) and I 
need a lot of water.  I also run the AC alot (hey...this is texas) and 
the water seems to evaporate pretty quick.

Any help or person experiences would be greatly appreciated.

    jdavis at bio_tamu.edu
    jmd9261 at tam2000_tamu.edu