My best offer has been the Xcards that I receive with the Wave 3 membership . I hand them to friends ,post them on boards,pop them into mailings etc. I get a new pack of 30 every month with W3 as well as other Freebees.
Sending a link for a specific product to someone you know is shopping for similar items, tell them about the discounts on almost every product we sell as well as Price bender auctions and special deals.