US-Mattress cuts up to 50% off a selection of mattresses as part of its Columbus Day Sale. Even better, get up to an extra 40% off select items. (Prices are as marked.) Plus, all orders receive free shipping. Deal ends October 12. Some best bets:
Walmart continues to offer the Simmons Beautysleep Foldaway Single Guest Bed, model no. IMCE030CBS, for $69 with free shipping. That's tied with our mention from a month ago as the lowest total price we've seen. (It's also a current low by $10.) It features spring suspension, an ultra-plush cover, and memory foam mattress.