Someone was selling about 20 of these on Ebay recently for like $1 each (all separate bids), but as usual, there's always someone else trying to bid for them. However, if I couldn't get them all, then I could at least snag the first one and any other just to spite the other bidder. That said, they're just mini booklets of production art for the show. Do enjoy, I guess.
Direct Download - https://mega.nz/#F!sBEkRCTL!ltNIi-xAmPTv8BBzwTTU6w
View Online - https://e-hentai.org/?f_search=blood+plus+booklet