Afternoon guys, I've had enough of my out of date sat nav taking me all over the shop, so am after an update. Car is a 2012 A4. there are DVDs on eBay, but unsure of quality, and they're asking £40 which seems a bit steep to me. (I got one for my previous car (M3) for a tenner). Is there a "go to" place for this sort of thing?