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Get them to give you a dofollow link, email to their list announcing the post, get them to add a banner for a month to their site, see wolf-howl.com examples.
Look up blogs on SponsoredReviews.com and contact them directly to do a review to save money.
PayPerPost.com, buy posts on there for like15$ per post, this is a really good one, lots of taffic possible.
Reviewme.com ALSO very good (what JohnChow.com uses, buy ads through them).