Hi! DualShock3s are sold for now (while I wait for more low-voltage LEDs to arrive). I do have a green LED Sixaxis controller available for $35 shipped US/Can.
I can now do green yellow or red, and in about a week blue.
Or.. if you're feeling crazy.. for $75 I can do a megamod. I replace the player indicator LEDs on top to be Red Green Blue Yellow, then wire it such that your PS logo LED is the same. So if your PS3 decides you are player 1, your front LED shows up red. If you are player 2, it shows up green.