This question brings to mind another question that has to be answered before that: What is the audience to which you're advertising?
If you're talking to friends about things you've found that you liked, advertising individual TripleClicks products is the way to go: You know the product, how good it is, and you can stand behind that product all the way. That's one of the reasons I love PURJAVA and the Supreme Whey Protein--I have used them, and I really like them.
If you're addressing an audience with a specific set of interests, you might direct them to an ECA store or a more general TripleClicks sales category that will engage with those interests.
If, on the other hand, you're addresing a general audience--anyone who comes by a site, for example, then yes, definitely promote the entire store because you don't know what will draw your reader's interest.
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This question brings to mind another question that has to be answered before that: What is the audience to which you're advertising?
If you're talking to friends about things you've found that you liked, advertising individual TripleClicks products is the way to go: You know the product, how good it is, and you can stand behind that product all the way. That's one of the reasons I love PURJAVA and the Supreme Whey Protein--I have used them, and I really like them.