New in the US. Where to get Propecia? Please help

[love]

Hi,

I am new to the US and it is great!! I have been taking Finasteride for a long time. I brought my supply with me but now I am running out of it. I do not know if I should visit a dermatologist or a general practitioner can prescribe Finasteride too? Also, which is the cheapest pharmacy and should I get Propecia or Proscar or generic Finasteride and how much it costs?

Any help is much appreciated.

Thank you guys.
Happy new year!