Personally, I went for the HPLHS complete fiction audiobook, but then, I'm an audiobook listener. I believe this is the book it's based from though: https://www.amazon.com/dp/B087ZTNSZC/ref=cm_sw_r_cp_apa_glt_AZB6JC4BJE515M99EA9D

Print editions are rather pricey, but the Kindle edition is cheap.