I’ve subscribed to this Taipei mailing list that sends “alerts” emails when flights are ~ usd200 to usd500 cheaper than the normal average.
They basically send a link to Google flights or skyscanner where you can buy the tickets.
I’ve subscribed to it few months ago and the deals looks decents. They seem to not monetised it (yet) , and I already bought 1 flight to Australia for usd 500 return ticket for Christmas.
Hopefully that can help some frequent travellers!
mod: feels free to delete if that looks like an ad, just wanted to share