There are lots of treatment centres that are free; just look on the interent or in the phonebook under addictions. There are also centres that do cost money (ALOT of money), but the free ones are...
25$
Methamphetamine cost about $80-$120 per gram depending where you are in the country.
It would be impossible to answer without knowing what specific drugs you are talking about.
if you need to ask, you dont have enough money...