Another alternative you can use is the book wrapping stick from popular as there's weight to it. Buy 4 of them (select the heaviest one) and tape together with electric tape and duct tape.
If you really want to use for practice but don't have cardboard at home, the first option is to buy a hockey stick, add weights to it using ice cream stick or newspaper and tape together using electrical tape and duct tape. The second option is to buy 4 book wrapping stick from popular, tape together using electrical tape and duct tape.