I buy liquid chlorine in five gallon carboys, currently for $19. It nominally is marked at 12.5% but tests at 14-14.5%. So it is like getting 7% at $1.90/gallon.

We have had the per-pound levels of chlorine listed on PF for di-chlor, tri-chlor, and various concentrations of cal-hypo, but I don't remember them. I do remember that di-chlor releases as much CYA(stabilizer) as it does chlorine and tri-chlor releases 60% as much CYA as chlorine.