Good deals on Splenda Products at Amazon with an additional 20% off with promo code SPLENDA9, valid through 12/31.  Here is a screenshot for your reference. Shipping is free on orders over $25.  Save an additional 15% by receiving the products at a regular interval and shipping is free with no minimum.  Some examples are listed with prices reflecting the 20% discount.

• Splenda No Calorie Sweetener, 400-Count Packets for $11.40
• Splenda No Calorie Sweetener, Granulated, 19.2-Ounce Bag for $11.98
• Splenda No Calorie Sweetener, Granulated, 1.2-Pound Bag for $11.98