In search of kids trailer bike (attached bike)

Hello! We are looking for a trailer bike attachment for taking my son to school and was hoping to find one her first before purchasing new. Anyone have one in the garage that is gathering dust? What we are looking for is something along these lines that will attach to the rack or seat pole of an adult bike. Thanks in advance! https://www.rei.com/product/843750/burley-piccolo-trailer-bike -- Maya Henry mayachenry@gmail.com 607.262.0055 www.mayahenry.com *Healthy Moms First: <http://healthymomsfirst.com/> Your 8-week roadmap to increased energy, more time and less stress*