C.R.
Hi D.! Here's hoping you have a wonderful trip to the World....I'm wishing some pixie dust your way!!
Unfortunately, if you are planning on only getting a 2 or 3 day park hopper, you will not find many discounts. The discounts don't really happen unless you buy 4 or more days. A pretty reputable broker, Maple Leaf tickets, is one set up this way. DO NOT under any circumstances buy anything listed on Craigslist or Ebay. Many, many people have been scammed this way - imagine the horror of paying for your tickets, getting to the turnstiles & finding they don't work, then paying again for the real thing!!
Some of the little booths scattered around Orlando are OK to use - they sell magazine subscriptions, timeshares or local retaurant coupon books and then you can get reduced Disney tickets. I personally wouldn't want to spend 2 hours listening to a timeshare presentation to get discounted park tickets, but maybe you would?
AAA is a good option if available and many websites can give you some good ideas. My favorite is www.wdwinfo.com and their partner message board site www.disboards.com. You will find a section on there called the Budget Board and another section called Codes and Rates that may help with your specific dates. The guys who own this site also have a travel agency called Dreams Unlimited that is really great to work with.
Another thing to keep in mind is that Disney can and will change their park admission at will. Usually rate increases are in the spring, but it can happen at any time really. If you wanted to order your park tickets in advance from www.disney.com, you will pay whatever today's prices are - even if they have a price increase between now and June. This is what I usually do - buy them in advance to get a few dollars off.
Think also about what you intend to do during the trip. Do you really need a park hopper? You can save alot by not getting a park hopper. A 3 day Magic Your Way Base ticket for an adult runs 67.67 per day. The park hopper option adds 15.00 per day to that price; it adds 22.50 per day to a 2 day MYW Base ticket! You will save between $50-100 per day just by choosing one park to visit each day and not hopping in between. And if you have ever been to WDW before, you know that you can easily spend a full day at each park - just walking around, not counting waiting in lines or waiting for shows/parades to begin!
And yes - you will be buying 3 adult tickets and one child. A child at Disney is 3-9 years of age.
Feel free to PM me or send an email if you want some more insight to the World! As an official founding member of the Mickey Mom's Club,.....I love to talk anything Disney!