Storage is always getting cheaper thanks to the unstoppable march of technology. That's particularly apparent in the prices of microSD cards, which are more affordable than ever. I remember once paying $100 for a 1GB SD card, but that was many years ago. Today, you can get the Silicon Power 128GB microSD card for $29.95.
The Amazon listing says it's down from just $31.99, but that's only the most recent stop in a downward trend. Last year, this card was more than twice as expensive, and a few months ago it was over $40. It's now about $10 cheaper than comparable Samsung cards.
The Silicon Power card supports UHS-1 speeds and comes with a full SD adapter. It seems to get solid reviews too, with an average 4.5 stars. It's Prime, so shipping is free for members.
This card is on sale for even less, just $24.90 until 1AM Eastern. It's a lightning deal, so there's a limited stock as well. It's only about 40% gone as of this posting, so you've got a shot. Don't wait too long, though.