Half-Gallon Motivational Water Bottles for $9.99 This post may contain affiliate links or sponsored content. See Disclosure Policy. Amazon WOW! Here is a nice deal on Motivational Water Bottles. You can grab these Half-Gallon Water Bottles for just $9.99 when you clip the $2 off coupon and use the code OMMMGTK9 at checkout. This should work on all colors. Thanks, Deal Hunting Babe!