If you want to have any chance at a nice specimen, whether it is a geode or not, pay somebody with the proper equipment to saw it correctly.
I'll try to find a place.
I've dug (excavation ) in SWMO for 30+ years .broke plenty of limestone. Never seen a limestone floater that round. And if we an isolated piece I'd bet heavy it is not just limestone
I'm close to your area. Like 45 minutes south i'm sure.
Never had a reason to ask, and its none of my business, but close for sure.