Looks like you must buy 2 100oz bottles. 3 different scents and/or type of liquid detergent. Might eligible for an extra 5% off with RedCard?
Persil also is offering a $2 coupon on their site here: https://www.persilproclean.com/us...ersil.html
But you will have to enter your phone number to get the coupon, which I didn't do. Not sure if/how it would work online. Perhaps in store? Big YMMV on this one, but it is an option someone might want to pursue to see if it works.