I have searched all afternoon for this offer after seeing people selling reduced price tickets on ebay for a profit or the info to buy them at 19 euro's and not wanting to be fleeced for free info.
Basically you print the PDF file linked below and show it at the entrance where you buy your disney tickets. The offer is valid until 31st July 2010 excluding 25th July. You can buy up to 5 tickets (adults or child's) with one print off for 19 euro's a piece (approx £16). You can print the pdf for as many days you require- there's no coding on it. Tickets are only valid for the day you purchase them on.
Disney tickets are usually £48 for an adult and £41 for a child- saving a family of 4 £114 per day.