Check out these great RO DI Filters at crazy prices:

http://cgi6.ebay.com/ws/eBayISAPI.dl...=3&rows=50 (Got my 6-stage from them for $125 delivered)

http://www.stores.ebay.com/theaquasafepurewatershop

http://cgi6.ebay.com/ws/eBayISAPI.dl...=3&rows=50