Walmart has the Slumberjack Shadow Mountain 35" x 88" 30-Degree Sleeping Bag on clearance for $17 with free shipping on $35+ or with Prime. Other bags on clearance include:

• Slumberjack Sky Pond 40-Degree 33" x 84" Sleeping Bag for $17.50
• Slumberjack 40F Sky Pond Mummy Sleeping Bag for $17.50