Ebay. Ridiculously cheap LED bulbs. Very questionable quality control, though. Free shipping from china means you can buy a couple for a couple bucks, try em out, and junk em if you're not a fan.
LEDs are in fact way more complex than incandescent. They're semiconductor devices, and manufacturing them is almost an art and very much a science, high-tech science at that. Because of their operating theory, dimming and color temperature and dispersion is much more complex. (Dimming generally wants a PWM signal of at least several hundred Hz, preferably a few KHz, unlike the 60hz your wall gives you. Color is very process-dependent. And they are directional just in the way incandescent is not, so you need some combination of reflectors, bulb shape and LED layout, and glass over the LEDs to get the dispersion right.) They also need the right heat dissipation - they generate less power than an incandescent bulb, but being semiconductor devices (and often used in conjunction with other solid-state devices like regulator and microcontroller ICs, and mounted on PCBs) the whole assembly is somewhat heat-sensitive, and so is the solder used. So cheap bulbs will tend to die quickly because they heat up and don't have the proper heatsinks or housings to direct heat away. Fun. Then comes the question of color; white light is really just blue, and we're more used to white light coming from yellowish sources, so even if you think it's pure white your eyes / brain might disagree after a while of using it. Two-tone bulbs using both white and yellow that allow you to regulate each tone individually solve that problem in a superb manner, satisfying the most complainy of the complainypants.
I also tend to think that rail lighting is far superior than lighting that attempts to be more ambient, if that makes sense. There, the directionality and color is more of a benefit and cheaper bulbs can be used.
Cree lights tend to be great, among quite a few others.
