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Theres loads of options now, Shopperpress is the best for affiliate type sites like amazon or ebay where you can import stuff with a few clicks.

That said you should check out these:

Templatic...

Not sure about a "shop page" or why you would need it? You could make it a shop catagory and add the products to there along with their specific catagory.

Do you not mean clicking a catagory and there you can see the products in that catagory in list or gallery format?

In other words, add the products to catagories and show these in the nav bar,...