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"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
( Hardware means so many things ) It sounds like you are asking about chips and connectors... Here, DigiKey and Mouser are the best organized ( good filter / search engine ) - least expensive. RS may be the better bet elsewhere.
Several board houses will make prototype boards reasonably. ( Note, I've only done small stupid boards and their free layout software wasn't very painful. _For small boards. )
Of course, if you want "metal and bone" I suggest McMaster Carr and the slaughterhouse.