Accmarket via Amazon offers the Alaska Bear TSA Luggage Lock
for $9.99. Coupon code "TSALOCKK" drops it to $4.99
. Plus, Prime members bag free shipping
. (Non-members can spend $35 to bag free shipping; otherwise, it adds $6.56.) That's $25 off list and the lowest total price we could find. It features a 3-digit combination that you can customize.