This is something that exists in Poland from at least 2017. I've done it for 2 of my children. Setup cost 700usd (based on package), yearly 200 usd - https://www.pbkm.pl/
It existed at least in 2006 in Serbia, and probably few years before that. Operated by Swiss CryoSave company. It was upfront lifetime payment, something around 2000EUR. Although this price was more affordable than cumulative monthly payments, there was a scandal with that company. I think they bankrupted, but some Polish cryo bank took the bio material. So maybe upfront payment is not that sustainable (who would have thought?).
Btw. we deposited stem cells for our second child born in 2010, and when this scandal happened I tried not to think too much about it and just be grateful that we don't need that material. It should be still safe in that other bank though.
