Walmart offers Ajax Liquid Laundry Detergent, Original, 40 Oz for $1.24.  Shipping is free with Walmart+ or choose store pickup!

Product Description:
HE: Works beautifully in all washers. Safe for septic tanks. Laundry Cleaning Directions - Fill to half-way between lines 3 and 4 for normal/average loads. Use full cap for large or heavily soiled loads. Works great as a pretreat - pour right onto stains and rub into fabric, Always follow garment manufacturer's directions and test for color fastness.