what mods do you have done to your truck?
The Valair clutch you can get direct from Valair. they are good people in my book and offer a 12 month warrenty on the clutch.
i bought my superchips from Robbie for $225ish, new they are ~$400. bought the Xzillarraider from a guy on cummins forum for $200, new they are ~$400. he even sent it to me long before i had his address. i was in shock. i got the part and installed about two weeks ago. sent him the check the next weekend. he told me to get his address of the shipping box. got the air filter/shield from a guy off cummins forum.
my best answer is to search forums and look for deals.