A real switch is cheaper, depending on what quality you elect to choose. The simplest 5-port GbE switches can be had for 1/5 the price of an Extreme (but be prepared that they will die about every other to every third year, requiring replacement), and a small 8-port managed HP switch with a bit more advanced network features can easily be had for 2/3 the price of an Extreme, which in turn won't be able to achieve that functionality, should you ever need it.