How to get mailing list users to refer friends to the site

[Moses]

hi
I am trying to set up a campaign to get current mailing list subscribers or new ones for that matter to be able to refer 5 of their friends in order to get the product for free (as opposed to paying for it)

so for example

1. mr A visits the site..signs up to the mailing list ..
2. mr A gets an autoresponder informing of a product ($ 10 for eg)
3. he can either pay $10 or invite 5 friends
4. he inputs 5 emails of friends
5. when B,C,D,E,F (his friends) get the emails and they sign up that when im notified that Mr A should get the product for free

does Aweber or any other service do something similar?

please help..thanks