David; I understand where you're coming from. But if a person isn't "Inclined" as you say to use the internet and have it as a source for buying ammo; then I really have no response to that. That simply means that a person won't use that as an option to shop. No different that a person who is dead set against shopping at Walmart. (There are plenty of those people too). But there's a big difference between saying you won't shop online or at walmart, and saying that a certain caliber isn't available or difficult to find. The 9x18 is 1/2 to 1/3 the price of 9x17 (380) ammo. 9x18 is available currently in more places than 380. Just because a person refuses to shop online doesn't make it not available. And FWIW, the gun shops I've been to in the last year (In 4 different states as well as numerous gun shows), usually had at least 9x18 self defense ammo. Granted, I wouldn't pay $18-$20 for a box of ammo to plink with. I'd buy the 1 or 2 boxes, which is all you'll ever need for self defense; and buy plinking ammo online.
But I do agree, that there are some people that are hard headed or ignorant. And if they can't buy the ammo locally, then they won't buy it at all. And as such, they probably shouldn't be buying a gun that's chambered in 9mm makarov. These same people probably wouldn't buy a particular car unless they had that dealership right there in their own town.
So, you definitely bring up a valid point. Guns chambered in 9x18 makarov, 7.62x25 tokarev, and numerous other calibers: "Including in the last year 380's in MOST places". Should NOT be bought and owned by people who are ignorant of the internet; can't or won't buy ammo on the internet; don't travel outside of their local community and has access to a greater variety of ammo; etc... These calibers are designed for the experienced gun owner or the experienced internet user.
So, I guess the right question to the original poster is: Are you the type of person who is willing to buy ammo on the internet? Getting the gun is easy through your local gun shop. (You have to do that or buy one at the local gun show). Also; does your town have many gun shows? If they do, then you can usually find 9x18 ammo there too. MOST gun shops will have some, albeit a small supply, of self defense 9x18 like hornady ammo. If not, they can get it easy enough. At what level of "Support" are you willing to give to a gun chambered in Makarov??? If you don't want to buy ammo online or similar; then don't buy a gun chambered in 9x18 9mm makarov.