I'm quoting a study that was done by the International Energy Agency in 2003. They estimated transport costs at $1 to $5 U.S. per tonne per 100 kilometres, and $1 to $2 U.S. per tonne for the injection part of it. The big part of the cost is the capture part, getting the concentrated CO2; that's the $25 to $50 a tonne cost.
On May 15th, 2007. See this statement in context.