I would invest in security cameras. After having someone get in my garage I put up cameras and a couple more motion lights, it's amazing how many people walk around in the middle of the nite while your sleeping.
I was at sportsmans guide today and noticed on a clearance table they had a bag of 50 BMG casings on clearance I didnt look at the price but if interested you could call and see how many in bag and a clearance price.
Kinda funny that they make it gun free when they host the biggest gun shows in the state a few times during the year. You need to take that beef up with the Minnesota Weapons Collector's Association, they're the ones who set the gun free policy at the gun shows, not the Minnesota State Fairgrounds....
Got a gander mtn add today federal 22lr 325 rounds for 24.99 a saturday special Not the best price but they are still hard to come by. I dont see a limit on the add