If the product is "Fancy Widget", you should buy "TheFancyWidget.com" "FancyWidgetBonus.com" etc.
No need to go crazy. But the right domain can bring you a lot of free traffic and high search engine rankings.
Then get mini blogs in place (need an example of a mini blog? see RobTheGenieToth.com ) ... have one optimized for "Bonus"... and create a hot bonus package!! ... have another for "review" and review the product and another for "buy" and take the typical but effective angle of "don't buy Fancy Widget until..."
Point is...
Start with the right domains.
Set up keyword specific mini sites or mini blogs (recommended) to target a handful of the typical consumer research keywords "scam", "review", "buy", "bonus", "discount" etc
Apply regular traffic gen and quick indexing strategies.