There are many firearms out of stock right now, manufacturers cannot run at full production due to pandemic restrictions and demand is higher then ever, there are rim fire rifles out there you just have to search for them, if there's a particular rimfire rifle your looking for post a question about the specific gun on the buds community and someone can likely help you find it.

Joseph, a combination of current events and panic buying about sums it up. You can find some by searching Guns / Caliber here : https://ammoseek.com/

Well, a pandemic + civil unrest + an election = demand for firearms and the demand has far exceeded supply for months now.