where to buy thermocooler

i have a cab. humidor and i want to add a thermocooler to it like the link:http://www.cigarasylum.com/vb/showthread.php?t=4676

i need to know where to buy all the supplies and how much it will set me baq. also im building a my cab. humi and i know the basics but i would like to have any little known ideas, very important things to do when building it such as the proper glue and the best joints to have in the wood, etc. thanks your Godfather