Free: Contests & Raffles.
I love my Truglo TFO (Tritum/Fiber Optic) they are Fiber optic during the day and night sights at night, but also pull in light in low light and supplement it with the tritium, I can honestly say that there is not a time that they are at all hard to see like some of the night sights that are set as white dots in the light. They run $80-150 depending on where you get them from. The only downside is that they are a little big on your slide, I think my font sight is almost 3/4" long... But I do have to say its definitely worth it. I have shot all the different night sights and can say they are by far the best that I have found. Cheapest way to get them is to go here to find the ones you need then search amazon for the model number:http://www.truglo.com/images/Handgun%20Chart.pdf