world... I'm looking for a plugin and/or theme that

Hello world...

I'm looking for a plugin and/or theme that is a couponing engine. To be more specific, what I need it to do is the following:

-- allow visitors to get the coupon by paying for it with their email address. Kind of like the plugin pay with a like.
-- allow admin to create users that can login and manage their own coupons and see nothing else.

Does anyone know of something that will work in this manner?

Thanks!!!