If you wish to store cord blood in a public umbilical cord blood bank, then it is free. However, this does not provide your baby with exclusive use of the cord blood if he or she ever needs it to fight of some disease or disorder.
Storing cord blood privately will cost between $40-50 per month in most states of the US and about $60 month in Australia. However, as this become more commonplace, umbilical cord blood storage will become cheaper.
Not sure how much benefit cord blood can provide? Check my Cord Blood Medical Treatments page.