$115 for 10ml. (4 vials of 2.5ml).
I use only 0.1ml (10units). That is good for 100 shots, that is US $1.15 per shot.
Your cost will depend on how much you use per injection (shot).
My insurance does not cover it.
I go to my urologist.

No I do not use this method.
I usually take 120mg of Sudafed if I am still rock hard after 2 hours. It gets flaccid after an hour.