I use these cards to take my 2GB Sansa Clip+ audiobook library with me. I've saved money by putting less memory in the Sansa and can store a large number of audiobooks in a variety of formats (WMA, MP3, etc.) with these cheap memory cards. I can also use the cards to share audiobooks with my wife and kids without having to manually transfer files from one Sansa to another. Also, it's several times cheaper than getting I-anything.
Smartphone Xiaomi Mi 8 Lite 6/128 GB, midnight black
70 Review
Memory card Samsung microSDXC 256 GB Class 10, V30, A2, UHS-I U3, R 130 MB/s, adapter to SD
50 Review
32GB High-Speed Micro SDHC Card - Class 10 UHS-I Compatible Memory Card for SD Devices
63 Review
Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
45 Review