I had 4x $100 gift cards and 4x $10 savings codes from the last promo, and $50 and $5 gift cards earned from Shopkick when I redeemed them at one of my local BBY last week. 10 cards to scan!
Before going to the store, I pulled up each gift card/savings code on my iPhone, took a screenshot of each of one so I could easily flick through them at the register.
I grabbed a variable load Disney card, asked the cashier to put $500 on it, had him scan my Shopkick QR code to earn more kicks on the purchase, and then showed him the first of the many gift cards on my phone when it came time to pay. When he caught on that I had more than one or two gift cards, he mouthed "wow" and got more and more excited after each one. To make it easier, he'd scan the barcode and I'd read him the pin, and on to the next one. When it came down to the final $5, I put it on my credit card and he exclaimed, "Wow, that's some savings!" Of course, not all those gift cards were free, but I'll take what savings I can get!