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