Amazon has Airbnb gift cards on sale in their Lightning Deals section. The discount is not showing yet, but it will once the deal goes live for Prime members at 1:39pm and 30 minutes later for everyone else. These deals usually go quick, so jump on it right away if you’re interested.
On top of whatever discount that Amazon will give you, you can also get up to 10% bacj through credit card cash back. You can earn 5% cash back with your Discover it card, which becomes 10% if you have the double cash back promo. Or you could use your Blue Cash Everyday or Blue Cash Preferred if you applied for the 10% back offers.