Supaguard is a paint sealant applied by the dealer can cost anything from a freebie of you bargain with them to buy the car or up to £200. It's good but not worth anything like £200 IMHO. Buy the kit of ebay for about £10 and do it yourself - a few hours work and job done.
e.g.
http://cgi.ebay.co.uk/supagard-supa...ryZ43117QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
cmc
I usually use Autoglym Extra Gloss Protection which is a similar thing (for the paint anyway) anyone tried the both or recommend any other product. I've only used the Autoglym in the past and the results were impressive however maybe only lasted upto 6 months.