I also have just been prescribed generic 5mg finasteride by my GP. I just went to Tesco to collect it expecting to pay a fair amount as it's not funded by the NHS. The pharmacist told me it was £2! 4 months supply of finasteirde for £2 is an utter bargain!
The trick is to go to your GP with the prices for Propecia and tell him how much you would save by using generic Proscar and that you are able to safely divide the pill up into FIFTHS, as most GP's will not instruct you to take a dose of 1.25mg.
The pharmacist did ask me a lot of questions saying that he could not understand how I was going to divide the pill into fifths. I just said my GP prescribed me that, what is the problem?
Anyway I still haven't taken the medication yet. I'm still waying up the pros and cons and propeciahelp is helping my decision