It has got to be the hardest to find now. i can find all others, some sparingly but if you look hard enough and long enough you can.
300 blk is hard to find but every now and then you see it at a ridiculous price, but Grendel ammo has been non existent for a while now.
Every search and everywhere i have looked there is none. not in desperate need for it but i look constantly and if i ever find it i will buy it unless it's crazy priced.
I been buying 224 a lot cause it's easy to find, much easier than 223 and about the same price.