From head-fi.org:
AliExpress codes - expire July 1st at midnight PST
here are codes that work in all the stores during this sale
4$ off 40$ - 6zuzu4
6$ off 50$ - 6ZUZU50
6$ off 70$ - 70zuzu6
9$ off 80$ - 9ZUZU80
10$ off 120$ - zuzu120
14$ off 140$ - 14ZUZU140
15$ off 180$ - zuzu180
24$ off 200$ - 24ZUZU200
$15 off $100 - 618RMN15
For those who couldn't use "zuzu" codes, here are some more:
4$ off 40$ - 6SUMMER4
5$ off 50$ - 6SUMMER5
6$ off 70$ - 6SUMMER7
8$ off 80$ - 6SUMMER8
10$ off 120$ - 6SUMMER10
16$ off 160$ - 6SUMMER16
15$ off 180$ - 6SUMMER15
25$ off 250$ - 6SUMMER25
3$ off 20$ - 618SUMMER3
6$ off 40$ - 618SUMMER6
9$ off 60$ - 618SUMMER9
15$ off 100$ - 618SUMMER15
3$ off 30$ - 6JUNE3
6$ off 50$ - 6JUNE6
9$ off 80$ - 6JUNE9
14$ off 140$ - 6JUNE14
24$ off 200$ - 6JUNE24
3$ off 20$ - 618RMN3
6$ off 40$ - 618RMN6
9$ off 60$ - 618RMN9
15$ off 100$ - 618RMN15
Please note, that the codes may not work on the "Superdeal" items, and may not work for some countries.