These features are not built into Vantage at this time, so implementation would currently require customization on your part.
In terms of payment options, Vantage allows you to add
pricing plans, however this is for single listings and featured listings, not specifically xx amount of listings for $xx (which is a feature we currently have in our
ClassiPress theme).
There is no specific coupon function as you describe, but potentially how you would do this right now would be to simply place a link in the description which takes the customer to a specific page on the business website containing a coupon image for printing. Thanks.