How much is a matching kar98 bolt worth?

If you have just the bolt you're lucky because they are considered interchangeable, If you have the whole action then you're looking at around $100.00 to someone who wants to build a rifle around the action. I have not idea on the price of the bolt only, but you can contact any parts suppliers and most will make you an offer. Otherwise you have to try to match it up to someone who needs one. Be advised that there are a couple of different types of bolts, 2 of the most obvious is the original Kar98 bolt which sticks straight out and the other was for the Kar98k and the bolt handle is bent downward. Selling to a dealer I wouldn't look for more than 20 bucks for that bolt. Good luck.

Do you have the rifle with the matching serial number? If not, the bolt would not be worth much.