Voyagin is a Western traveler-oriented site from Rakuten (the Japanese company that owns Ebates).

They have discounts for transportation and/or experiences mostly in Asia: Japan, Hong Kong, Singapore, India, Indonesia - some are gimmick-y, like a robot cafe - but my first purchase was a discounted ticket (10% off) for the tried-and-true Tokyo Limousine Bus from the airport in TYO - you can get tix for NRT (Narita) / HND (Haneda) into central Tokyo. Not a huge discount but I put that yen toward omeyagi/onigiri and was not mad about it.

Here's my referral link (referrers get $5):
https://www.govoyagin.com/referrals/2064023375