My dropbox public dominion folder has the dividers from BGG.
The origin of these dividers is on BGG, but it's a couple more clicks, and requires you to have a login.
The dividers above are incomplete, some of the new expansions (empires and 2nd edition cards) have not been made. So I found another resource to get those (slightly different format though).
Here's the wooden box used (also mentioned in various BGG threads): Hobby Lobby Artist Box
Here's a much lower cost solution to the laser-cut dividers BGG Thread for low cost divider lanes
Here's the complete box setup with dividers Case + Organizers
Here's just the dividers (box not included) Organizers
Here's the sleeves I highly recommend: Mayday Euro Sleeves
I'd also highly recommend getting play mats. Sleeves + Playmats make picking up cards very easy and delightful. You also need to worry less about the surface you are playing on (wet, sticky, etc). Amazon UltraPro Play Mat