They range in price from 69.99 to 108.00 depending on whether you want a 4 gallon (actual 3.2 gallons) tank with it or not.
I am very pleased with the RO/DI unit. I am also very pleased with the support I've received. They have answered all emails within 12 hours.
The only drawback to the unit is it does not have clear canisters but white ones. Doesn't really matter to me as long as it produces 0 TDS water. It produces 1 TDS after the membrane and 0 TDS after the DI cartridge. The DI cartridge is huge....alot larger than my old Kent Hi-S unit.
The rejection rate of the 100 gpd membrane is 90% though so the 100 gpd membrane isn't the most efficient membrane out there. But all 100 gpd membranes are this way. You can drop down to a 75 gpd membrane and it's 98%/99% rejection rate.
Anyway I'm very happy with my new RO unit.
here is the link. It's an e-bay store and they are in Vancouver BC so shipping is only a day. I ordered on Monday night and it was shipped on Tuesday and it was here on Wednesday.
http://stores.ebay.com/The-Aqua-Safe-Pure-Water-Shop_W0QQsspagenameZstrkQ3amefsQ3amesstQQtZkm