I've been online for a while and I've used coupon, discount offers to make some great money :-) Actually I even approached some people before to give me an exclusive coupon and ran a full campaign for products. Coupons, Sale, Discount, Voucher, gift Cards are popular...So if you have a site that can offer a discount code or a freebie, you can also drive traffic to your site.
How? By submitting your deal to freebie sites. You see, those sites are updated on a regular basis with latest deals. And as they cannot be all over the place, their members update those sites. That is where you come in :-) As a good member, you can post a simple ad on their site letting them know about discount or a coupon you are offering.
Here is a list of sites to post to, but keep in mind, these approve manually so if you think writing a spam post will do you good, no it will not.
;-) enjoy!