Amazon has the Coleman Palmetto Cool Weather Sleeping Bag for only $16.49 (Reg $37.99) with Prime Shipping. It features three pounds of ColeTherm insulation keep you comfortable down to 30 degrees, Thermolock System prevents heat loss through the zipper and is completely machine washable.
If you are not already a Prime Member you can join with a 30-day free trial of Prime, as a student with Prime Student, or as part of Amazon Family.
Please note that Amazon prices are subject to change at any time and may have increased or decreased since this offer was posted.