My Canada Sources routinely sell 20mg Sildenafil Citrate (v1agra) for 50 cents or less per pill and no prescription.
The dealers I have used over the past few years include:
There are many more Canada dealers listed that I have not used yet, so do shop around for the best price on Sildenafil Citrate (Generic for v1agra)
I recommend starting with a small dose of 20mg which works well for most of us. 100mg is far more expensive and could be an overdose resulting in side effects for us. Details here: http://www.magicbluepill.com/dosage.shtml