I bought an 8oz can of fluid .., http://www.amazon.com/Rema-Tip-Top-V.../dp/B006P3C92S, and a 100 count pack of sunlite patches probably 3 yrs ago. The can seals tight so the fluid hasn't dried out, and I have many patches left. It will be a long time yet before I need to restock.

Edited to add: This, of course, is for home use. I carry spare tubes on the road and patch when I get home.