Amazon has the 11.75oz Wickedly Prime Mustard (Creamy Garlic Aioli) on sale for $1.94 with free shipping on $25+ or with Prime (extra 5% off for 5+ S&S orders). In addition, two other flavors (Dill / White Wine Jalapeno) are on sale for $2.83. 

If you want to buy in bulk, the 6-pack (in 2 flavors) is on sale for $10.21. (Roughly $1.70 per bottle)