Hi there,
Drug companies will often provide assistance to those who cannot pay for the drugs. This is usually just a percentage of the cost but might provide some relief.
I have also included some links below with a bit of info on how to go about getting assistance. My advice to you, though, would be to talk to your doctor or someone else at your local hospital about possible sources of assistance in your region.
Good luck and take good care-
Laurie
http://www.ehow.com/how_2065154_get-breast-cancer-prescription-drug.html
http://www.cancercare.org/get_help/assistance/cc_financial.php