Try a cobbler/shoe repair store.
+1. Or else a tack shop.
Look for Lexol products specifically. There's a leather cleaner (orange bottle), a conditioner (brown bottle), and their neatsfoot (cream colored bottle). You may be fine with just the cleaner and conditioner, but their neatsfoot is an excellent, non-greasy product. IMHO, Lexol is the best leather care stuff available.
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