Beside low commission of $1 and no closing fee, they also provide free trade on 23 Aug 2017.
Can signup an new account here tastyworks.com
Oversea or non-resident of US, when opening an account chose Margin and non-residential. The paperworks is quite straight, transfer of fund instruction is clear within 5 days the fund will be deposited and the help desk people are really helpful and most willing to answer any questions.
Do note that Tastyworks is an oversea broker and not regulated by MAS.