Twice is a site where you can buy and sell Women’s clothing(similar to thredUP), and right now you can get a free $10 credit just for making an account here. Once you do that, go here and download their iPad app. Open the app, login to your new account, and you’ll get another $10 credit. You can apply this to shipping($5), so you can get some clothing for free. Also, if you send in a bag of clothing using one of their prepaid bags, they’ll give you another $10 bonus credit.
-Update- They now have an iPhone app, so you can get another $10 credit if you have access to an iPhone or iPod touch. All you have to do is register here first, then open the app and login and the $10 credit will be applied to your account.
-Update 2 – Enter coupon code: SURVEY10 to take another $10 off at checkout. This code stacks on top of your credit.