In the time I've been on the forum (two-plus years) I can't remember reading that anyone had a blood transfusion during prostate-removal surgery.
Did any of your get blood? If so, how much? Did you bank your own blood (autologous units) ahead of time?
I asked my surgeon if he wanted me to donate my own blood ahead of the surgery and he said, "No, we won't need it." As it turned out I lost some blood during open RPP, but didn't need to be transfused.