請教 Pijing, xiaobaitu about PERM and H1B extension?

請教 Pijing, xiaobaitu about PERM and H1B extension - 3 years:
I am working on the PERM process now. However, my H1B first 3 years will be ended this Oct.08. I wonder if I need to extend my next 3 years for H1B and what's the price now. If my PERM is approved , do I still need to extend H1B for another 3 years??? Thank you very much!!!