Butchers sell pigs blood to make black puddings with.

Cute icon.

LOL!

Depending on the butcher, it could be free. If it's in an area where there's little call for it, you could get it for free. Just like if you go to a fishmonger in an area where people don't use fish heads, you can get them free or cheaply. But if he just went to Chinatown, he could buy the blood out of big buckets, just sitting there waiting to be ladled out. No special trips needed!

And he probably pays for it in moneys. I'm sure he'd have no trouble getting enough to pay for that - it wouldn't be very expensive. Maybe by pawning lost items that he finds while slouching through the darkness?

But he could moonlight!

Well, actually, they had to pay rent and/or taxes, whatever it was, to keep the hotel in their hands. They almost lost it once, or did lose it once. I'm guessing he got money from the investigations, either as fees or donations. I haven't watched Angel in so long.

well.. i think Angel has some of that "immortal wealth" left over from his Angelus days. He never seems to be broke. Even when they started out in LA, him and Cordelia and Doyle... He always seemed to have plenty of cash despite their meager caseload and all the pro-bono work.

Well, I'm thinking he has little passion for the finer things in life, since he's dead and pure. That could have easily been him just... mixing things up, in his mind ;) Pig's blood, rat's blood; whatever.

You know vampires. Old money.

Or maybe he manipulates using his powerful vampire charm.

I figure no butcher would just give it away. Health codes, ickyness. Unless he's a vampire contact and knows what he needs it for.