You can sometimes find them at bookstore chains but you can also get em on Amazon! If I’m allowed to include a link, here’s the first volume (there are 4 volumes currently): Bloodborne Vol. 1: The Death of Sleep https://www.amazon.com/dp/1785863444/ref=cm_sw_r_cp_api_glt_fabc_2SZVQHH5SBPR849CS9RY
I got the physically copy from amazon but you can get digital copies from comiXology
Amazon link: Bloodborne: The Death of Sleep https://www.amazon.com/dp/1785863444/ref=cm_sw_r_cp_api_i_xq-VCbWN45WJ7
You can but the trade paperbacks on Amazon, there are 3 of them so far. It's an anthology series, so they aren't directly connected. First one is about the hunter and paleblood, second is treating the beast plague and the church, and the third follows Eileen the Crow.
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And there is a fourth in production now.
Great series, particularly the healing thirst, enjoy!