Hi, I have this character, lvl 6 paladin, lvl 4 blackguard. What is the cheapest way to get the vampire template on him (after he get's bitten by a vampire). I'm only really interested in the drinking blood of humans/humanoids part and having the right to call him vampire. I don't really need the combat bonus stuff, as I want him to be a vampire for the fluff.

Help please?
(books available is PHB 1 and 2, DMG 1 and 2, and other books I might be able to borrow)