I think it depends on what you want to get. If you're looking for anything 9mm or 223, or any firearm related to it, or any polymer framed semi-auto pistol that shoots 9mm, it's a tougher thing to find.I just a lever action and bought the 45 ammo for it all online with no issues.
In terms of reloading and reloading supplies, small pistol and rifle primers are almost nonexistent - the supply can't keep up with the demand. Any powder that's good for reloading 223 is also almost nonexistent. Pistol powders are easier, but powders that are good for 9mm are harder to find than others.
My meager supply of primers is dwindling, although not so much because I'm shooting, but more that I'm just doing a lot of reloading so that I can get out to the range more later on.