I live in MN and in reality, I have seen little changes in the price of firearms and even availability is close to normal for many of the more popular guns. Our LGS has used Glock 17's at $450 and a good selection of Rock Islands at under $500.
That said, ammo is a different story.
What you need to consider is capacity which in my opinion will become a major topic in the coming weeks.
I am literally down to two semi-autos that hold more than 10 rounds and both of those guns have a factory 10 round mag in the bag.
I reload so I can only pass on some advice to people that are considering adding another gun to an already stocked collection and that would be, buy ammo as that has become the most difficult part of our hobby to find.