Where To Get Nuts? (and Bolts?)

Ok I've Been Seeing Bolt Kits And Stuff On Ebay. But I Was Wandering If There Is A Reliable Source Of Nuts And Bolts..like For The Body And Interior? The People That Work At The Local Nuthouse Are Idiots Andcan Never Seems To Come Up With Anything Related To Automotive...i Mean It's Bad. If You Even Mention That Your Using It On A Car They Tell You They Dont Have It...