Hi Melissa,
We got our mattress from the following place in Pottstown, PA:
Magic Sleeper
We gave them a template for the mattress and selected the firmness and thickness we wanted and they had it ready for us in a little over a week. We are fortunate enough to live within an hour's drive so we can show them in person what we wanted and to pick it up ourselves.
It costs us around $150 and we are very happy with it. They ship also.
~Wendy