The best method to promote the products offline is-
first make a site hving the offer link!
Post flyers having your site name and post on your or your son or your little brother college campus!
see that the offer should be something like free xbox,psp,games online etc
or in parking of Big Malls!
here you can use some offers having gift cards because these people are shoppers so they will definitely take the free shopping gift card offer!
These are the Best offline promotions!
Fliers on windshields pisses people off. I built my full time computer business on offline marketing methods and finally wrote a book originally called Sneaky Advertising and Marketing Tricks.
If you're going to place fliers on cars try to place them in the drivers side window or the handle of the car so the driver doesn't get into the car, then have to get back out to get the flier.
Make your own so they're cheaper
Get a descriptive domain for the top of your card and redirect it to your site
I've placed these cards and received calls on
and a bunch more places I cannot remember without coffee this morning.
With everyone online offline methods are working great.