I searched last year without any luck and ended up buying new NOS ones (not cheap)
I think most folk get them reconditioned.
SRM have been making them for a couple of a few years now (at least 4 years)
Most of my lifters get reground to suit different cams so it’s not always cost effective to buy new and have them ground to a specific size. If staying stock then it’s not a bad idea if your lifters are shot.