The $9 Expedient Tritium Night Sight

Over on Arfcom we find this example of out-of-the-box thinking:

http://www.ar15.com/forums/t_10_17/686350_Make_EXPEDIENT_TRITIUM_Night_Sights_for_the_Survivalist_for_abt__9.html

The OP, "EXPY37," took the tritium vial from a bivy marker sold on eBay and installed it in a hole drilled in the front sight of his pistol. This gives him the equivalent of Trijicon night sight for about $9 plus his time. In contrast, a Trijicon front night sight will run you over $60 from Brownells.

Unfortunately, the tritium bivy markers are not legal to sell in the US, but can be procured from overseas vendors on eBay.