I purchased a new mattress to fit my fold-out futon frame, from Walmart.com.

And the reason I chose Walmart at that time is because they offered good products, mostly first-party inventory (despite the marketplace format) but moreover, they offered a quick add-on option at checkout to hire a haul-away service to come to my door and haul away the junked, old mattress.

I own no vehicle; I live on the second floor no elevator, and the haul-away service was a godsend and a bargain price.