I love this one: http://h30094.www3.hp.com/product/sku/2545791 http://h30094.www3.hp.com/product/sku/2545791 I bought several of them. But it has no scrollwhee

I love this one: http://h30094.www3.hp.com/product/sku/2545791 http://h30094.www3.hp.com/product/sku/2545791 I bought several of them. But it has no scrollwheel (I don't like them).