Yes you can! – please email email@example.com.
Bear in mind, while Vigor routers are covered by a 2 year warranty, power packs only have standard 1 year warranty. If outside warranty there will be a fee.
Alternatively you can probably get a similar spec. power pack from Dick Smith or Jaycar. Make sure it has the same output voltage, same or higher amperage (higher Amps is OK since the router only takes as much power as it needs) and the same connector to fit your Vigor router. I suggest you take your Vigor router or its power plug pack to the store to make sure the connection is the correct size.