Net Days payment option

Hi,

I been trying to find a plugin or a way to achieve the Net 30 payment option for the wholesale customers. I mean there are tons of payment option like paypal, credit cards, but what about Net 30 where the customer is able to purchase items and is do for payment in 3o days? I mean there has to be someone that is in need of that paymant option, Any help in directing me to a right spot or any help with this would be very much appreciated.