Vitacost.com a great online store is offering a FREE $10 credit to new customers when you sign up here. After going through the link click the "click here now" to create a new account. You should receive a message after submitting your information letting you know you will receive your email with your $10 credit code shortly. Also you can grab a referral link and when your friends make a purchase (which why wouldn't you with free shipping and $10 credit) you will get another $10 in credit to spend
Also even better, right now you can get free shipping on the following item at Vitacost. What is nice is that if you buy one of these items that qualifies for free shipping then the rest of your order ships free.
Right now there are 3 items under $10