Anne,
There are two solutions. The first is to go to eBay. Many people sell the four theme park tickets for a few $US. I am not crazy about this, as I hate paying for something that is free, but if you HAVE to have them, that is a choice.
A better choice, in my opinion, is to go to a site that posts the PDFs of the maps. I love the site
www.WillCAD.org. On this personal site (and not an official Disney site), you can find good quality map PDFs of the four parks, the resorts, water parks, Downtown Disney, the BoardWalk, and other locales. I simply LOVE this site!
Sure, they are not the actual maps, but for my uses they are more than great!
Have a magical vacation!