Define cheap. If you’re trying to print something copy-righted, any proper retail/commercial service won’t do it unless you have a release to do it. The cheapest way would be to buy an inkjet printer and a ream of paper. Print from PDF as duplex and imposed 2 pages up. Depending on your printer, you may have to feed the paper back into the printer to print the second side. Gather the printed sheets and staple through the spine. Yes, the cost of the printer and paper will be over $50 and take several hours, most likely.
Best regards, Bhaskar Singh.