Walmart has the Spa Sensations by Zinus 8" King Size mattress on sale for $125 +tax
You can choose to pay by Discover through Paypal for an additional 5% CB
Alternatively, Amazon also has Zinus memory foam 8" King Size mattress on sale for $125.
https://www.walmart.com/ip/Spa-Se…thena=true
https://www.walmart.com/ip/Spa-Se…thena=true