Also available is the Playskool Poppin' Park Roll-N-Pop Express for
$7.99 $6.99 with free shipping for Prime members. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.65.) That's the lowest total price we could find by $7. It includes three balls and features a pop-up monkey in the back.
Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (Note there is currently a wait for the Amazon Mom program.)