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Just don't make your links look like cheesy third-party banners, and don't be shy to take all credits for finding best deals for Your Visitors.
These are all great ideas, does anyone have any more to add?
It has a picture of the product, the price, and a "buy now click here" type of text on it.
The reason is this - somebody searches for a product and they find your site in the top results. They come to your site and have no interest in reading the text, they just want a quick link to buying the product fast.
It works very well for me.
I then put a few text links throughout the article, and then usually display the buy image again right at the bottom (or a variation of it).
Whatever you do, try and make sure you don't look like you're "selling it to them". The last thing the potential buyer might need is a salesperson attitude, it could put them right off. Be their friend that is giving them a lucky tip, that way you could get a few more conversions.