microSDXC memory cards and readers.
I picked up the Samsung Evo Select 512GB microSDXC UHS-I U3 during Amazon's pre-Black Friday sale for S$75.52, well below its usual S$120. After much research, it's the best-value card for the Nintendo Switch.
I bought the SanDisk Extreme 128GB A2 MicroSDXC card from iRoyal on Lazada for S$33.50 during 11/11. My order stalled, and when I asked, the seller apologised, explaining it had gone out of stock after my purchase.
Searching for a USB-C SD card reader, I found SanDisk's Apple Store option at S$75 expensive and SD-only. I instead settled on the Satechi Aluminum USB-C Micro/SD Card Reader from Amazon at US$14.99, though it ships only via a forwarder.
The SanDisk Ultra 200GB MicroSDXC Card was an Amazon Gold Box deal in March 2016 at US$59.99. That's a remarkable drop from its US$399.99 launch price just a year earlier, making this high-capacity card finally affordable.