Allthatwhichis: Yep, that's the one!
Here is a
link to the graphs for the three different color dichro's that Edmund's sells. Reflectance is on the vertical axis and wavelength is on the horizontal axis. Note that the reflectance is very high for the rated wavelengths (99% or better), and for the "pass-through" wavelengths you're only going to loose about 3-5% to reflectance.
Bridge:
Edmund charges $45 for a 25 mm dichro. The 12.5 mm dichros are $40.
Did you even look at the link before you posted?
Adam