"Don't think that would work. For one, it has to be a willing sacrifice." The only angel who might have is Castiel, and Sam's pretty sure that Dean's higher on Castiel's list than he is.

Still, he leans over the table and nods. "Nothing too out of the ordinary for spell components. I think we can probably do this without having to source anything new." The Men of Letters were meticulous in gathering things like spell components and Sam's been good about keeping the supplies stocked up. "Right. I guess no time like the present."