Just go make this. Hopefully your Whole Foods has $3 watermelons on Mondays (Manic Mondays-- specials all $3 throughout the store!) to make it even more cost effective.
This is delicious!!!
Makes 2 smoothies:
2 cups watermelon (I just leave the seeds in, they are good for you!)
3/4 cup organic 365 frozen strawberries
6 spearmint leaves (I use from my herb garden outside)
Juice from 1 wedge lime