Best bet is give the smaller shops a call and check first. BP and Cabelas will be open, I know Cabelas hours will only be 12:00-5:00.
Did some checkin on a couple of handguns last weekend at both these places, and

I couldn't believe the price differences. Cabelas (on the Kansas side) was $100 cheaper on the same gun than it was BP (Missouri side). Have to pay the FFL fee in Mo if I bought the gun at Cabelas but thats not a problem. Rifles and shotguns you can walk right out with.