Best Labor Day Mattress Sales 2018: 30-Second Summary. Our Recommendation: Amerisleep AS2 is the best sale that we found on mattresses for this Labor Day holiday. It is priced at $1,099 for a queen sized mattress. They also offer a whopping 20 year warranty and a 100-day trial period. 2018 Black Friday Mattress Sale Previews and Guide. Get Prepared for the Black Friday Mattress Sales. It’s almost Thanksgiving once again, and that means Black Friday mattress sales and Cyber Monday Mattress deals are right around the corner, too. .