Anyone know if they still make 500-700w power supplys with green leds?

The only one I can find atm is the Adata HM series. The colour of the LED changes depending on the load; the LEDs will be green in low load, blue in medium load and red in heavy load.

Here is a review for the 650W version:
http://www.techpowerup.com/reviews/AData/HM-650W/
I'm fairly sure the 550-850W units the series use the same design as the 650W version, so they should have similar performance.