You could try just contacting them and asking when they expect a restock.

Someone else already mention serverpartsdeals, I’ll go ahead and add on to that. They have manufacturer recertified HDDs as opposed to seller refurbished drives. Avoid refurbished drives. I have a dozen drives from them ranging from 8-18TB and yet to have one fail, the older 8TB drives being maybe 8 years old now. Reach out to them and find out if they are going to have any more holiday sales - I’ve found better deals better than Black Friday on electronics well into December.