I got these LED map lights off of eBay for $18.99 from a seller that goes by "maple125." They have an assortment of colors to choose from (blue, red, amber, green, and white). I chose white. They came very well packaged in bubble wrap from Toronto and took 5 business days to get here from there.
Contents of the package:

They supplied several adapters for each panel of LEDs.
Regular map lights:
Start by removing the clear plastic cover. I didn't take a pic because we obviously all know what it looks like. Then, you need to half-way remove the flimsy reflective backing. Be super careful because the edges of the metal are sharp and it can be a pain in the ass to get out. Remove it from the side that is farthest away from the windshield. You WILL need to bend it just a slight bit. It will just hang there.
Pull out the little spade light. This is where you can have your wife/gf/concubine help partake in removing the light especially if they have small fingers!
Use this adapter that came with the set:
Connect the above piece to one of the small panel of LEDs and then insert the spade part into the map light socket. It took a small amount of pressure in order to get it in there for me. (Careful, the LEDs are so bright I almost blinded myself.) Now replace that metal piece and bend it back to normal. The LED panel has a sticky side to it but it helped me in no way. So, I took some of that blue sticky stuff that one can put behind a poster to help it stick up on a wall. Be sure to make it centers so that the light will shine through the circular magnified area.
Now put the clear plastic part back in.
One installed so far:
Both of them installed:
View from the backseat. You can definitely tell the difference between the two different kinds of lights:
Outside views:
What I would've done different:
--Daytime installation or at least had a damn flashlight with me so that I could try and see which way the spade in went in because I couldn't see what I was doing.
--Bought two sets (for the backseat domes) instead of just one.
--Read a tutorial like this.
I got the second set in today and installed the rear dome lights.
