Only 350 copies will be made worldwide, each signed specifically, so this is a very exclusive collector's item - essential to any Massive Attack fan, not to mention fans of strange artwork (like myself).
"When I was about ten years old, a kid called 3D was painting the streets hard. 3D quit painting and formed the band Massive Attack, which may have been a good thing for him but was a big loss for the city."
- Banksy (Swindle magazine, 2008)
If you're interested in purchasing the piece, here's a link.