Curiously Strong Peppermint Gum

I have recently discovered that Wrigley’s has discontinued Altoids Gum. Now, I find the Pepperment gum to be a wonderful way of stopping a headache, so this makes me very sad. I’ve just gotten a supply through CandyWarehouse.com, but they will eventually run out. So, here’s my question: I need a strong Peppermint gum, not sweet, relatively hard, to use when I can’t get Altoids gum anymore. Suggestions?