Like some brother suggested, I tried asking doctor at polyclinic for ED drug. I was there for some other problem. The doctor was pretty friendly, so I asked him since I am here, could I trouble him for a prescription for ED. He just asked me if I have taken them before, what have I taken and the dosage. Then he wrote me a prescription for a month's supply of generic viagra (he said that is the only thing they can prescribe).
Went to CGH a few weeks later and collected the drugs. Less than $19 for 28 pills. GST absorbed by govt too.