The below article reports it as $5, but updates are now reporting that the men are charging $20. From Gawker:
A group of men has begun charging $5 apiece for photos of the new Banksy piece in East New York today, according to the Instagram account streetartjamz. This development is the most compelling thing about Banksy’s latest work, which before had just been a stencil painting of a beaver gnawing on a felled parking sign.
These men, heroes that they are, have elevated the original work, turning it into a performance piece about the commodification and hipster-fication of people’s homes. If you’re going to treat a neighborhood like an art museum, why shouldn’t the residents of that neighborhood charge admission like an art museum, particularly when many New Yorkers would never come to that patch of the city but to take a picture of a stencil painting of a beaver?