Just received an email notification that Uber gift cards are purchasable online.
Note that the Buy Online link redirects to CashStar. This means that you won’t get an Uber-specific bonus (such as an Amex offer) nor a travel bonus.
If you need an Uber referral, I’d appreciate it if you used my referral link. I’d get $20 off my ride while anyone who uses my link gets $20 off their first ride.