kamalone45 , What you can try is the zoomer support 1st link below for a replacement part or try ebay 2nd link or Amazon for used broken toy with good part required. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.zoomerdino.com/#/en_US/support
http://www.ebay.ca/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR1.TRC0.A0.H0.TRS0&_nkw=Zoomer+Dino+Boomer&_sacat=0