S.E.
Rats... We bought our daughter's first big girl mattress at Mancini and it was a Serta. We shopped at the one on Saratoga and Quito/Lawrance. They were really great for us and helpful. Maybe try a different store. I love her mattress so much, I often fall asleep while reading her stories or get up in the middle of the night (when she's come in the master bed) and sleep in her bed.
Sorry, I can't be any help.
S