Dick'S Sporting Goods offers the Kelty Mistral 40° Sleeping Bag in Shadow/Smoke/Blue for $19.98. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $28. It features a thermal hood, draft collar, and a 40° temperature rating.
The planet will thank you, your local (overwhelmed) landfill will thank you. Even your budget will thank you.