You can buy most of the stuff from auber instruments:
Pid controller (sl1612B) 12vdc controller 37.50
K type thermocouple 9.95
Thermocouple panel jacks 5.36
Solid state relay 5 amp 7.20
All those items are from auber.
I got these from Radio shack
DC power jacks M type (need 3 female) 3.69 each
DC power jacks M type (need 2 female) 3.69 per 2 pack
10 cfm dc powered fan, ebay has them for around 5-6 dollars
12 volt DC power supply. I used one from and old cable box. You want one that has 2 amp output. I seen some on ebay for around 5 to 6 dollars. The power jacks need to be sized to the power supply that you get. If you take them to radio shack they will get you the right size.
If you order a pid controller from auber instruments they send instructions of how to wire one up. I will try and draw a diagram and post it if I can figure out how to post a file.
Radio shack also sells some project boxes that would work really nice to put the controller in, I made mine out of some scrap laying around the garage.
you'll need some 18 or 22 gauge wire. i used a small dog dish to attach the fan to the smoker. I will post some pictures of that.
Some items have to be soddered, but most of the connections can be made buy terminal connection.
I am going to test it out this weekend will let you know how it works.