Amazon has the 4-Pack of Amazon Basics Dish Soap (30oz bottles, Fresh Scent) for $12 - 5% off with Subscribe & Save (can cancel anytime) = $11 with free shipping on $25+ or with Prime. Two bonus offers for more savings: 

• Qualifies for the 20% off $50 Prime Promo. 
• Qualifies for 10% cashback with a Prime Card.