Third-Party
Upsized cashback on Airalo. They offer various travel eSim cards. Have used them in the past and it worked seamlessly.
For those preferring a smaller but more direct discount, you can use code NOMAD15 for 15% off your first order. Don’t think both can be combined as ShopBack says only listed voucher codes may be used.
Note the nomad code can only be used for the first order so not valid if you used Airalo before