Were can i buy my soul to lose by Rachel Vincent ?

I've been reading her "shifters" Collection and i love it -i highly recommend it- and i wanted to read her other one "soul screamers" and the first book of the series's "my soul to lose" is impossible to find! could you help im dying to start the Collection but it's unavailable at most place were as the second one "my soul to take" is available. can you help?