How about a yellow pointer.....in fact a yellow/red/green pointer for around $40?
2 of the lens dichro's from PS3 laser sled (look in group buy section of Laser pointer forums)http://www.laserpointerforums.com/forums/YaBB.pl?board=group_buys Or try ebay.
and one of these from DX http://www.dealextreme.com/details.dx/sku.12338
.....oh and access to a lathe.
machine the cap thus.....
Make an end cap from aluminium to give a mounting point for dichro's
You will soon need to be puting power on to the lasers to set up the dichros, I suggest you make an adaptor for connecting up to a 3 volt power supply as the batteries will not last long if used for setting up.
I used a rubber bung, with a hole through, that was a tight fit in the front barrel of the laser. Cut a shallow notch across the front face of the bung, a red wire with the insulation stripped where it will touch the case of the laser was passed through the bung hole. Solder a black wire to the cut off cap of a brass wood screw, insert through hole in bung. The 2 buttons can be held down with tie wraps.
To remove the dichro's from behind the output lens of 2 PS3 sleds unscrew the lens assembly and remove it....
...Underneath you will find the part you need
trim the two tags off and trim the plastic all around. Stick a copper wire mount to it and glue it over the green laser with araldite, masking tape will help with positioning......Be very careful that glue does not go down the holes toward the laser output lenses.
Take a second dichro add a wire frame and fix that one over the red laser using masking tape to hold it in place for sticking. To get the position correct you need both lasers on try to get the beam to hit the centre of the dichro. Cover the back of the green dichro with a piece of black tape to prevent internal reflections. Once the glue is set you can make small adjustments until you get the beams perfectly combined.
Turn up a sleeve to protect the dichro's, add additional glue to hold it all firmly in place.......
Once you have it all adjusted add a cap to keep the dust out.
It is now capable of red, green and yellow output
Beamshot (with slight camera shake and well used battery :)....
Further details may be found on Laser pointer forums here http://www.laserpointerforums.com/forums/YaBB.pl?num=1212787199/0