A program that grants points for using Bing search, which users can redeem for gift cards, sweepstakes entries, or charitable donations.
Hi, I'm John! I am also waiting for them to restock this gift card.
Sadly, no one have control over restocking from here, and support doesn’t have a fixed ETA either. It’s more of a wait-for-restock situation.
I suggest sharing your feedback directly with Microsoft Rewards team. You can do that by visiting https://rewards.bing.com then scrolling down to the very bottom and selecting "Provide feedback".
I will provide separate feedback on your behalf, as the more users provide feedback, the better Microsoft can understand the demand and hopefully work on the issue sooner.
I hope this helps!