Prob not much different than you have in OK. No specific stores that I know of dedicated to prepping. In fact I have never been in such a store and I have been at this a long time.
What specifically are you looking for?
The Bunker- in between Seneca, Missouri and Wyandotte, Oklahoma....about 30the minutes south of Joplin. Army surplus supplies, MRE's, mylar bags, first aid supplies, some guns and ammo, field guides, etc.