Mamiamjo,
I don't know how far this is for you, but Napco on Spring Cypress rd near 2920 has bulk 10+% liquid chlorine at $1.68 / gal. I bought 2 x 7 gal Aqua Tainers off Amazon. You have to have a container with a decent sized opening, but they fill you up right there. I keep 2 single...