Would be great and I think is necesary having the option to add coupons to listings.
THis would help to promote listings and to sell listings packages.
I think would be very usefull. Not a complete Coupon theme inside Directory theme, just an option to add one coupon code to a listing with some options, a sticker, bar code and expiration date. Something simple.
(I think there was a similar or same idea around here, but I can not find it now. please let me know if there is a similar idea already voted, and I will erase this one)