link： https://www.plumdistrict.com/?ref=uac5c653f13b
+ Sign up through a referral link to get $5 credit
+ Check out the today's deal and click "Make it Mine"
+ Your $5 sign up credit will be automatically deducted
另外http://www.fatwallet.com/有7.5%的cashback
第二次结帐的时候，会自动出现20%的coupon，可以随便买多少张都可以~~~~
注意：Code要在24小时之后才能redeem
