That's your truck payment you mean, or the price of some hardware? IIRC the 12 I got cost me a little less than $100 at the time. Another thing you could do is use stainless nuts.
ETA: I found the invoice. At the time, it was 12 x TIFLN10FG M10x1.25 @ $8.91 each, so $106.92 total.