Asok ESB Rangefinder
All that's left for you to do is install some LEDs and a stalk and you're good to go. The raw asok 3 piece kits run for $21 so I'm adding $20 for prep/paint/shipping. The Perspex lens block snaps right into the top housing section firmly.
$40 shipped, if your outside the US you pay for the shipping.***SOLD***
mrgr8ness self-contained LED unit
These run $52 plus time to build one. I'll sell this brand new one for $45 shipped.***SOLD***