Ace Hardware in my area sells stainless steel nuts and bolts. They are spendy but it's one of the only places you can find them at here in MN. I'm not sure if they are national though.
1999 3.0L Cougar: 220fwhp and 200tq
2003 VW Passat W8 with 4 Motion AWD
http://www.cardomain.com/ride/300644
PM for intrest in 3L SVT Contours, 3L swaps into your current car, Prepped 3L engines, or anything 3L related.