Prices must be going up! I got some for jig making from B&Q last year at £35 a sheet, solid one side with patches on the other. No problems with unexpected voids and it was quite flat. Paid that for some 9mm Latvian last month. According to the importer "the Finns are now running all the Latvian plant so it's just as good"; so the curl at one end must have been their poor storage then?