Storing cord blood?

Nabi • Mom of 2: girl born in 2015 and boy in 2019
Has anybody decided to store their baby's cord blood? And if so, how did you decide on a cord blood bank? We are trying to decide if this is something we want, mostly because there is a family history of leukemia and lymphoma. But the banks seem terribly commercial and expensive so far. Not sure if it's worth it.