I'm planning to run a Bitcoin node on something like a Raspberry Pi, so I started to look for high capacity SD cards, and I found this one on Amazon
https://www.amazon.co.uk/Gentai-Designed-Android-Smartphones-Tablets/dp/B08FDLXL46/ref=sr_1_13?dchild=1&keywords=1tb+sd+card&qid=1602316988&sr=8-13The price has come down from £30 I understand, and before you rush off to buy one. Have a look at this video -
https://www.youtube.com/watch?v=Idh4-DzeFDwIt seems these cards are old, low capacity ones, that have been modified to appear to have !Tb of memory, but probably only have 1Gb or so. They have been on Amazon for some time, and I'm surprised that Amazon doesn't do something to block such sales. Some of them even have 5 star ratings that are obviously fake. A 1Tb Sandisk Extreme card is about £300, so a card for £10 is obviously a scam.
Remember - If it looks too good to be true, then it probably isn't.