You could pry get one at that price of craigslist. They are not cheap brand new out of a box, and I have never seen oneunfortunately they are not cheap..i was hoping for under $60 ...maybe i m just dreaming
One thing to consider, Kam, is that when you get a used one, you will most likely need to change out the cartidges. Depending on the size of the unit, you could easily spend $50 or so on the replacements. Just a thought....
To give you an idea:
http://www.marinedepot.com/RO_DI_Replacement_Filters-FIRORP-ct.html