Here is the parts list. If you need help email me and I'll do what I can to help.
12v-6 amp power supply - if you are not going to need heating 2 amps or above will suffice
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
RH and temperature controller/relay - This is what turns the fans on when the humidity drops below whatever you set it for. It is also what controls the heat if you need heat. I can draw up a wiring diagram on how to wire this. Let me know if you need one
http://www.ebay.com/itm/AC-DC12V-Int...item25913809b7
fan controller - this will allow you to control the speed of your fans. The speed will likely depend on the size of your humidor. Smaller humidors should use lower speeds and larger ones....well you get it
http://www.ebay.com/itm/181442289824...%3AMEBIDX%3AIT
fans-these are dependable, quiet and cheap but you can use what ever fans you would like. The bottom link are fans with blue LED's built in
http://www.ebay.com/itm/Mini-Univers...item5d3ec9f54a
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
blue led lights - these are glued to bottom of fans for a lighting effect
http://www.ebay.com/itm/261538954430...%3AMEBIDX%3AIT
red led lights - these are glued to heating fans
http://www.ebay.com/itm/261538954430...%3AMEBIDX%3AIT
power connectors - these are used to connect the power supply to the humidifier's main control panel
http://www.ebay.com/itm/271357415251...%3AMEBIDX%3AIT
fan and lighs connectors - these are used to connect everything. they are small so they do not get in the way and clutter the cigar box or whatever you are using to build the humidifier
http://www.ebay.com/itm/20-PAIR-Micr...item3a917201e3
Plastic Jars - You pick the size or use your own
http://www.usplastic.com/catalog/ite...4619&catid=604
heat shrink wire wrap - these are used in place of electrical tape which is bulky and looks horrible
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
grommets - these are used to dress up any holes you will need to drill for wires or the bottons on the humidity controller
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
heat sync - You will need two of these to dissipate the heat from the heating elements
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
heating element - You will need 2 of these. These are pads manufacturers use for heated clothing. The are quite safe at 12 volts but do not pump more voltage than that into them. two of these would be sandwiched between two small pieces of aluminium sheets (can be bought at any Home Depo) and the heat syncs would be glued to either side.
https://www.sparkfun.com/products/11289
wick for jars to distribute humidity
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1