Amazon has their Mama Bear Gentle-Care Baby Laundry Detergent (pack of 2) for $16.09 for their Amazon Prime Members when you clip the 30% off coupon. This is 95% Biobased, Bearly Blossom Scent and does 106 Loads which breaks down to $.07 per load! This is created for sensitive skin free of phthalates, dyes, and artificial scents.
NOTE: This deal is available exclusively for Amazon Prime Members. If you do not have Amazon Prime, you can get a 30-day free trial here.