Guess this is old news, but I haven't had to buy ink in a while and just found out the twin packs for the z3100 / z3200 have been discontinued by HP. Having to buy the single packs basically adds 30% - 35% on to your ink costs moving forward. Glad I bought my Canon ipf8300 now back when they had the killer deals in the summer. My z3100 will see a lot less use now for sure.
