How to bypass payment option

[ncwebpros]

My client deals with companies that he invoices them Net 30. He still wants to have the shopping cart functionality on his site and display different pricing depending on who logs into the site (site visitors, dealers, manufacturer reps, etc). But he does not need to collect their credit card info. Simply select the items they wish to purchase, "add to cart" and then click "Submit". My client will receive an email with the products they want and he in turn creates an invoice and mails it to them. (Don't ask me - that's just the way he wants to do it for now).

Is this possible with Virtuemart 2? If not - any suggestions?