In Sept of 2008 I watched a movie in a hotel in Swift Currant SASKATCHEWAN. It was about a trio of young adults that went to Mexico to acquire some drugs, They drove al older chev CorVAIR, Blue, Met the drug supplier, one member swollowed the drugs, ( yucchh) then they tried a double cross or to steal back their money, Anyway it got worse from that point on, one of the guys dies of overdose, The couple arrived at border to get to USA, a shooting, and girl is only one that gets back home.
I have been trying to get the name and eventually a copy of this movie.

Rx (2005) (http://www.imdb.com/title/tt0357182/)