Help With Seeds Please.

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I am soon to move into my own house and am looking forward to doings some
trichome farming. That being said I am specifically looking to grow three separate strains, and only flowering 3 plants.
Which means getting feminized seeds...Right?
I have done some research (most of which on this site)
Dj Shorts BlueBerry Indica
BC HashPlant Indica/Sativa
C13 Haze Sativa
All of which are said to be good hash making strian's.
Does anyone have advice on getting these exact strains?
I have never done this before and in my research I picked
up on more unhappy customers then happy.
I am looking forward to finally have a controlled environment
to experiencing the true difference between Indica and Sativa.
Any advice is apprietated.