Ambient advertising is all about getting the name of your website seen in as many places as possible. If you already need to buy letterhead and business cards, then having your website address added to these will normally cost nothing extra on the printing costs.
Similarly, you must think of all the other things that you do to promote your business, and simply add your web address there too!
Of course, you can spend extra money, purely on promoting your website offline, but firstly you should explore all of these opportunities which have already been paid for.
