i am sure you will find plenty of great tips on here. My parents raised us 3 girls on small salaries. My dad worked for city and mom was a teacher and then day care worker later on. But they found a way to get us there somehow, i still don't know how! lol......but we had a pop up camper and we took that our first few times and we loved it. fort Wilderness is very nice and worked for us and was inexpensive. We cooked at the campgrounds when we could to save money and we drove from TX, of course gas was cheaper 25 years ago.
Our later trips, we stayed off site and you can get some great deals off site. Of course I LOVE staying on site, but if money is a big concern, then try a disney value resort or off site somewhere. Renting a house is a good choice for a large group as well. Use disney transportation, don't rent a car (even though renting one is our preference). you can get around pretty well with disney transport.
Buy souveneirs in advance- the glosticks at home at target etc. that saves on that- and set up expectations for the kids- one souveneir they can buy etc. Make them earn disney dollars with chores- let relatives know to give them disney dollars for birthdays and holidays.
We also have an annual garage sale at my mom's. There was a garage sale thread years ago on the budget board that i used and it has paid off ever since. we make a TON at our garage sales. use brightly colored signs, all same color- use dark arrows pointing direction and only put the address and words garage sale. don't put hours on it- just put the signs out when ready and take them down when you close. put small things in ziplock bags- like makeup, hair stuff, lotions, candles- people go nuts for stuff in ziplocks for some reason. hang all clothes- make a clothing rack with rope or something- my dad built us a custom one that is huge that we set up. make it easy for people to sort through. we 've made over a thousand at a garage sale easy and saved that for our trip.
I also used to buy disney dollars and save those up throughout the year.
check flights often for best deals. try booking with
dreams unlimited or another disney
travel agency on the dis- they were able to find me discounts I would not have otherwise found- such as booking me with a 'group' rate for another group that was going- even though we weren't with them.
save any tax refunds or other windfalls for the trip. it can be done if you work it right. IT is EXPENSIVE. but it is so worth it.