If your marketing budget is tight then you can always rely on old fashioned, do-it-yourself options like manually optimizing your site and submitting it for inclusion to the search engines. To do that though you'll need to have a thorough understanding of how the search engines really work and how to interpret the results you get from your efforts over time so that you can improve your rankings.
If your goal is long term success on the web then we highly recommend that you study up and develop an intimate knowledge about how to make the search engines work for you. There's no better place to begin your education than at www.SelfPromotion.com. Be prepared to read and read and read some more. There's a ton of valuable information there and you won't benefit from any of it if you don't take your time to read it all. Plan on several visits to the site to get through all of the information.