I've had decent luck with Intex brand but stick with the double layer and check it right away. I bought one that came off the assembly line defective with poorly connected seams. The warranty is only 30 days but I think Walmart's return policy is 90 days. You can purchase with a pump, but I want to say last time I bought one the stand alone pump was like 5 bucks plus an arm and a leg worth of C batteries. You can find a decent one around 40-50 bucks.
Elevated queen, no king... 74bucks/wit pump.
Really interesting question but unfortunately I've never bought mattresses from there. If I was you, I would call or visit the website.
Thanks! Your answer is awaiting moderation.