Hi blondiee712,
I’m not sure where you are exactly in Oklahoma but the better options and possibilities I’m aware of in the area around Oklahoma City are in post #2 here.
Montgomery Mattress in Ardmore, OK may also be worth considering if you are further south.
Post #2 here has more about side by side split layers and “falling through the crack” or feeling it at all wouldn’t be an issue with a suitable cover.
Phoenix