Thumb Score: +17

Double Wood LLC via Amazon [amazon.com] has 180-Ct Double Wood Supplements Magnesium Glycinate Capsules (400mg) for $13.95 – 30% when you ‘clip’ the coupon on product page – 10% when you check out via Subscribe & Save = $8.37.
Shipping is free with Prime or on $35+ orders.

Savings
Extra 30% on the first order. (check and activate [amazon.com])