Warning: According to amazon reviews, these sd cards are not very reliable and may die after a few months.
Don't use them for sensitive data.
http://www.amazon.com/gp/aw/cr/B00P8XSR6I/ref=mw_dp_cr
I have a 16Gb version of this card, it's not bad.
I get 12MB write and 27MB read speed.
The only problem with my card is that it's a bit too thick and sometimes it's difficult to remove it from the slot.
There are a few other deals with this code:
http://en.jd.com/search?category=&keywords=JD558&categoryNam…
E.g.
4cm thick doormat/bathroom mat US $2.99
http://en.jd.com/product/915285.html
Xiaomi piston earphone (version 3? not sure) US $10.06
http://en.jd.com/product/760841.html
Xiaomi MI Band - back in stock! US $9
http://en.jd.com/product/813423.html
cheers.
didn't need it.