Where can I find a center punch with an 8 inch long shank?

Need a center punch with 8+ inch shank...doesn't matter what diameter. Any ideas where I can find one? Longest I can find is 6 inches. Thanks!|||what are you using it for? you can make one if you have a metal lathe and say, keystock or thick enough steel rod. i'd shop around more first|||MAKE ONE OUT OF KEY STOCK