Update satnav

[Crofty]

Hi I have a 66 plate insignia that needs the satnav updating vauxhall are telling me that it's £95 for a usb stick anyone know of a cheaper way of doing it please 

[Biga81]

I’ve seen on eBay that you can buy a usb satnav upgrade but I’m not sure if it’s for your year or the earlier models with the navi 600?