Quite a bit, you can get it commercially and it only costs a couple hundred per appointment per month (for the lowest tier of blood) and some health insurances cover it after deductibles

It is a bit more expensive to reserve a personal blood boy/girl but you can choose the exact traits you want from the person you're getting it from and is worth it imo

I personally have a cute fit blonde blood girl with sparkling light blue eyes to help with my feminization process