The only things you should need to buy from a hydro store is medium and nutrients. everything else can be got at wal-mart and home depot. You'll save a fortune building your own system.
As far as name and address, I don't see what the concern is. Over half (if not more) the fresh veggies you eat in the winter time at the grocerers are hydro grown. but yeah, look it up in the nurseries in your local area they should carry at least some of the things you need. I am forced to buy mine online due to the fact the closest hydro place is 2 hrs. away.