For a bolt, they're expensive, but in the context of auto parts, they're not that bad. I'm seeing anywhere from $3-$8/each, but having trouble finding the finer thread bolts (12x1.25 or even 12x1.50). I found an old post from FrankR saying that he bought a box of them, I was hoping he'd have some left.

89 Raider V6 manual
89 Montero 2-door Coupe "Super Legera"
91 Montero 4-door manual (Mint! Sunroof, cruise, power everything, BOUGHT FROM THE ORIGINAL OWNER!)