How to make a foam roller for under $15 in less than 15 minutes
CanDo Foam Roller - White PE foam - 6" diameter (15 cm) — Classic Health
IBF Iron Body Fitness Acupoint Foam Roller - 12", High-Density EVA Foam Roller for Deep Tissue Massage, Back Pain, Yoga, and Physical Therapy - Black and Red : Amazon.ca: Sports & Outdoors