Link exchanges are free and if you use good relevant reciprocal links they might be an advantage to you.
Also, I use Overture to help promote my site.
I have 40 keywords and keyword phrases listed with them and if you choose well you can find several for 10 cents per click. Overture has a minimum clickthrough per month charge of $20 but if you choose your keywords well you can get a good return for your money. When bidding make sure you are in the top 3 spots and if your budget doesnt allow you to be at the top 3 then find a diffent keyword. some can be as much as $4 or $5 per click so I would recommend choosing wisely.
Also, you can look for related directories to the services your site promotes and get listed in them. several are free of charge.
I hope that can help you.
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