Heh, heroin does cost about that much, same for methadone, at least in the UK. I can get 100ml of 1mg/ml methadone for GBP 10 which will keep me stable for a day or two; a GBP 10 (i.e. 'tenner bag' or 0.2g) of heroin is enough for a single IV shot for many users. Of course, depending on your tolerance, that may well not be enough, but my point is that 'legal' heroin would probably be much cheaper than current 'street' prices. I'm not sure how cannabis prices have varied in places where it's legal in the US, though - do taxes bring the price back to parity with the old 'street' level? I'm guessing it's going to be complicated by the fact that it's still illegal in other states?