Your studio doesn't rent floor time for practice? That's seems odd to me. I think most studios do. At mine, for $5, you can practice all day if you want, as long as you don't get in the way of lessons going on.
If there's a friendly atmosphere among the studios in your town, perhaps you can practice at another studio.
If you belong to a gym or the YMCA, they often have rooms with wood floors they use for exercise classes, but you could use them when no classes are scheduled.
Maybe you could see if a school gym or dance room is available to you.
Good luck!