For a mere £100K a tatty copy of Dreamscape 1 could be yours.
Very rare as only about 30 000 were ever printed.
http://www.ebay.co.uk/itm/Dreamscape-1- ... SwLzdWSIg3
An interesting article by Weed from a few years back on why 'Although often advertised as "rare", DS1 is one of the commonest flyers sold individually on eBay. See the Dreamscape section of the Price Guide for an estimate of its current value in mint condition.'
http://www.raveflyers.co.uk/dreamscape.htm
Also some mentions of the Metro article Tav / Angerflyers managed to get them to print re: DS1 = £100k
http://www.raveflyers.co.uk/wwwboard/messages/346.html