What’s the best thing you’ve bought from Ali Express?

AliExpress can be really hit or miss depending on the seller.
But every once in a while you find something surprisingly good.
For me it was a mechanical keyboard kit that cost way less than Amazon.
I also noticed some working coupons earlier:

AliExpress US Exclusive Codes

RDT2C $2 Off $15+

RDT4C $4 Off $29+

RDT7C $7 Off $49+

RDT9C $9 Off $69+

RDT16C $16 Off $109+

RDT25C $25 Off $169+

RDT35C $35 Off $239+

RDT40C $40 Off $329+

RDT55C $55 Off $459+

What’s the best thing you’ve found there?