Taylor makes CYA reagent in 2 oz. and 16 oz. bottles, nothing in between. This site has the 16 oz. bottles for $5.90 + $5.00 shipping. Ben says the shelf life of the CYA reagent is "years" meaning more than 2-3 years. Looks like a pretty good deal to me.
https://asp5.secure-shopping.com/sps...&CurrentPage=2