Not the cheapest, but thought might be useful for someone.
This are in the middle in terms of firmness compared to Ecosa(Firm) & Winkl(Soft)
100 Night Trial
10 Year Warranty
Free Returns & Delivery
An extra $50 off the discounted price is also available with a referral code.
Also don't forget cashbacks like Kiwiwallet is 5%.
Reference old thread for Comments regarding firmness