The SanDisk MobileMate USB 3.0 is the smallest USB-A microSD card reader I've found, at 31x21x9mm and just 3.4g. I bought it for S$12.88 to pair a 512GB high-endurance card with my Tesla's dashcam recording.
The last buy from Yodobashi Sapporo, the Elecom USB-C Memory Card Reader reads seven card types, including CF, SD, microSD, and MMC. It retails for around JP¥2,670; after a 5% VISA discount, I paid about S$29.
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 Moshi Cardette 3 is in its third generation, hence the number, neatly coinciding with USB 3.0. It's a USB 3.0 card reader with a built-in 2-port USB 3.0 hub, and at just 88g it's wonderfully lightweight and travel-friendly.
The Desk Genie Non-Slip Charging Desk Stand holds your phone while it charges, and doubles as an 8-in-1 memory card reader and a two-port USB hub. The package bundles the stand with eight different charging connectors and a charging cable.