I've drove myself nuts spending hours and hours over the last couple weeks trying to get a good price (because if I couldn't get a good enough price we'd be driving - and our trip is in 19 days!!) I used
this page at Deb Will's site the most (because it lists all the airline websites, which ones you can't get throiugh Expedia, Travelocity, etc.) I finally got our tickets around 3am this morning, lol, for $1500 (6 tickets, including one for our under 2yo, so he can sit in his carseat.) That's flying out of our local airport (Kalamazoo, MI) into Chicago, then Orlando. If we'd wanted to drive to Detroit or Chicago (same distance basically) I could get it down to around $1050, but we'd have to drive 2.5 hours there and back, it would mean an overnight stay (Chicago is an hour behind us, and our flight to Orlando is around 7am, to get to the airport early enough we'd have to leave around 2am and that's just not worth it. lol) We'd also have to park the van for 10 days (which isn't cheap and DH wasn't real comfortable leaving the van in another city, and leaving the house looking like we weren't there.) So the extra $500 to fly from home was worth it to him (big deal, he's the cheap one, lol.) The kids are thrilled because this will be their first trip on a plane and their first trip to Disney (and their first trip to the ocean, we're trying to cover all our bases here. lol)
Quite a few of the cheaper tickets I found I saw were out of Boston. There were a couple airlines that only flew out of the east coast and were quite cheap (something Blue?) You may very well be able to do better than $200.
After going back and forth between Travelocity, Orbitz, Expedia, Hotfare (?), Priceline (last resort because of not knowing the times with 4 small kids), and each airline's own website, I was pretty shocked to find the lowest price at Travelocity. The best I could do on the airline websites was around $2000. I was surprised because most of what I'd read said the airline's own websites are usually the best deal. I'm glad I kept checking!