Walmart offers the Calm Yoga Block 2-Pack, model no. 05-0718, for $5. Opt for in-store pickup to dodge the $5.97 shipping charge. That's $10 off list and the lowest price we could find. Each foam block measures 3" x 6" x 9".

Also available is the Calm Yoga Pad, model no. 05-0758, for $5, also with free in-store pickup. That's $8 off list and the lowest price we could find. It features foam padding and measures 12" x 8" by 1".