This seems to be a good price for a 2010 update, IF it's the correct option for the Kenwood 8220, which it looks to be (?)
Buy Cheap Garmin UK & Ireland SD/Micro Maps - Reviews UK
If you look around on the site I think there's a 2011 version too, albeit more pricey
I have an 8220 bt myself and have often thought about updating the mapping (it's Garmin-based, as I'm sure you know) Haven't bothered as yet, mainly because I do a fairly low annual mileage and my factory-loaded maps (either '07 or '08, can't remember) have always got me to where I need to go - so far!
If you do go ahead and buy can I ask you to report back in true guinea-pig fashion on the process (hopefully straightforward) & end result (hopefully successful!) ?
I would consider sharing costs BUT wondered whether the SD card is coded/protected in some way to allow 'one-time only' or single user download .... ????
In fact in return for any 'shared cost' agreement, I'd be looking in principle for an assurance from, say, yourself that the update had worked okay in your own 8220 + some guidance on the process involved
One other point ..... I understand that these same updates are available in DVD version (either read by the system itself when the disc is 'played' in the Kenwood unit or instead transferred by PC) and wondered as to the comparative merits vs an SD download ....? Like I said, this is not really my forte ....!!
I would certainly have been interested in sharing the cost for the latest update however I'm sure that I have read somewhere that the sd card has to be left in the unit for it to work.
I may be wrong but it was my gut reaction when I first read your suggestion, I think this is how they make sure that you can only use it on one device.