Where to buy cheap memory foam mattress?

haflander thought this was worth mentioning said
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I’m looking for a new queen-sized mattress. I read the other thread about Purple but was looking for more general advice. I’ve slept on an old-school firm spring bed for years and usually have trouble sleeping on other beds. However, my sis has a firm memory foam mattress that I like. Can my fellow mehmbers suggest where I can get one cheap? Please feel free to tell me all about the online options such as Casper and Purple as well as retail places like Ikea (I live around Dallas). I’m not picky and pretty sure I’ll get used to whatever I buy as long as it’s firm. That being said what are the cheapest options out there and what’s the $# I should be expecting? Thanks!