Hi! I'm Dane Carlson, and welcome to the Business Opportunities Weblog. I've been publishing this website, by myself, and sometimes with the help of others for over twelve years now. You'll notice two things about this site right away:
Some eBay entreprenuers are making $20 to $30 selling a coupon they (and probably you) got in the mail for FREE.
ValPak sends out a blue envelope every month full of coupons for house siding, haircuts, oil changes, etc.
In the current mailing in some regions of the USA they are including a Northwest Airlines/KLM coupon voucher for a $100 USD discount on roundtrip travel in the continental US and Canada. The coupon has no black out dates, no limited seating restrictions and no 7-day advance booking requirement.
Some entrepreneurs realized the value of the coupon and quickly posted listings on the online auction site.
Moral to the story: Look at your junk mail a little closer.