ammo

As far as I know Federal (American eagle), Remington (UMC) still make it. Others may have more insight but I think it's not a caliber that they load all year, similar to hunting ammo which has also been scarce.
I have always found 30 carbine difficult to buy off the shelf. I think you'd be more likely to find it online when it does become available.

To be honest I believe that ammunition purchases have moved on line rather than something stocked at local shops anymore. I really can find 30 Carbine regularly.  

forgot to mention LAX Ammo out of California.  They manufacture new 30 carbine. Not a bad price for $183 for 250rnds. I've ordered other brands from them and their a good company however I've never bought their brand of any caliber.  I "hear" good things online, I may buy some of their 9mm to try first.

There is quite a bit of Remington 30 carbine on the shelves in the stores around Kingsport Tennessee in my area. Just bought some last week with gift cards I got for the holidays. Luckily our stores around here's shelves are getting full of ammo again. Even Russian made tulammo 762x39 which surprised me since no more imports from Russia for the foreseeable future. If you have a Dunham sports store near you check them, they seem to have a lot of ammo in mostly all calibers available. So much so, that's where all my gift cards come from from the family for the holidays, they always have ammo.

I have used the LAX, shot 500+ rounds of it. Shoots good and reloads well also. PS, check Freedom Munitions if LAX is out of stock, they are the same company I think. Also, you can probably find a free shipping promo code for being a first time buyer with either. 

I’m in CA and two of my local gun stores seem to always have a few boxes on the shelf. Not cheap, around a dollar a round. I bought a box of Remington when I started reloading to have some as a reference, and a box of another manufacturer (forgot who made it) as a birthday gift to my brother in law when he was given his grandfather’s carbine. These are smallish independent gunshops, not bass pro type places.

Timothy wrote: I’m in CA and two of my local gun stores seem to always have a few boxes on the shelf. Not cheap, around a dollar a round. I bought a box of Remington when I started reloading to have some as a reference, and a box of another manufacturer (forgot who made it) as a birthday gift to my brother in law when he was given his grandfather’s carbine. These are smallish independent gunshops, not bass pro type places. As has been before by others reloading this round is pretty straight forward: trimming is the only additional step as compared to straight-walled pistol calibers. Economical as well.