The Ikea Slitbar which phatch referred to is this one:
You may find it to be a bit short, since it is just 8 inches, or around 210 mm. Unfortunately, the VG-10 steel core Slitbar only comes in that single length.
A slightly longer knife which is also VG-10 steel is the 240 mm Tojiro DP. It is available from Amazon's Italian web site at the following page:
The price of EUR 70,54 is not that much more than the shorter Slitbar (which is EUR 49,99). It also has what I consider an advantage, in that it is not a "Damascus" blade. The problem is not performance - both blades are laminated - it's that the Damascus lamination will look absolutely awful once it starts getting scratched up. Better in my mind is to have an honest work knife which you won't mind quite so much about how it looks.