Finally, they counsel suppliers to become members of systems in which they can sell to numerous agencies or departments such as states that enable their cities and counties to purchase within their systems as mentioned above, or supplier networks such as Epylon (www.epylon.com) Simplexis, (www.simplexis.com), Onvia/DemandStar (www.demandstar.com), or NIC Commerce (www.niccommerce.com) which connec