First, it depends on where you are now. Can you get a full test for us? If you have high CH, you don't want cal-hypo regardless of cost. If you have low CH then you can evaluate cal-hypo vs bleach plus calcium increaser costs.
You can play with the pool calculator to find out what the cost is for whatever units of those are actually comparable. Like, for your size pool, if 1 lb of cal-hypo adds X ppm of chlorine and Y ppm of CH, then how much will it cost for the correct amount of bleach to give your pool x ppm of chlorine and how much will it cost for the correct amount of calcium increaser to give you Y ppm of CH.
But, you still first need to know if cal-hypo is even something you need to consider in your pool. Maybe you can't use it regardless.