Trusted online platforms like Dundle and Thankbox sell eBay e-gift cards that are delivered via email.
Sites like Kinguin often list eBay gift cards, sometimes at a slight discount, though these are often for specific regions like the US. Important Restrictions where can i buy ebay gift cards in stores uk
Since you won't find them on a physical gift card rack, you must use digital or alternative methods: Trusted online platforms like Dundle and Thankbox sell