Don't laugh, but for decades, my family used an old thick dowel rod for rolling out dough. I think it was my grandmothers originally. They came over to the US from Italy back in the early 1900's and didn't have much money at the time so they were very frugal with everything. We never had an actual rolling pin until about 5-6 years ago, lol.
Obviously if you are shopping for a marble one that's going to cost much more, but wooden ones you might find super cheap of you look around. Even thrift stores or flea markets will sometimes have them. Another place to look would be a craft supply store, believe it or not - sometimes they are sold as decorations for craft projects, but they would work just fine as a real rolling pin too.