I recently got my hands on a GAMDIAS Ourea optical mouse as part of a promo package. This is a low cost, entry level gaming mouse that offers a good amount of features, specially for the price point.
In Greek mythology, the ourea (Ancient Greek: Oὔρεα “mountains,” plural of Oὖρος) were progeny of Gaia, members of the Greek primordial deities, who were the first-born elemental gods and goddesses, children of Gaia – wikipedia