TL;DR: Now through Aug. 9, Best Buy is bundling free Best Buy e-gift cards with select Apple Gift Cards.
If you regularly spend money in the Apple ecosystem (e.g., App Store purchases, Apple Music subscriptions, or hardware), Best Buy has a deal to get extra value out of that spending.
From Aug. 3 through Aug. 9, Best Buy is bundling free e-gift cards with select Apple Gift Cards. If you buy a $50 Apple Gift Card, you’ll get a free $5 Best Buy e-gift card, and buying a $100 Apple Gift Card gets you a $10 bonus card. All you have to do is add the card to your cart and check out — the promo will auto-apply.
Best Buy will email you the e-gift card after your order is processed or picked up. As with most of these promos, it requires a valid email address, applies to in-stock items only, and excludes Marketplace products. If you already plan on paying for Apple services or saved-up app purchases, it’s an easy way to pocket free store credit for your next tech purchase.
Source: https://mashable.com/tech/aug-3-best-buy-apple-gift-card-deal