You can easily pick up $100 worth of goods before you've ventured even 10 feet into a Disney store, but you're better off practicing some restraint. Enjoy the experience of just looking first. If you see something you like, think about it while you enjoy the rest of your day. You might see something even better in the next store. If you're still thinking of that beautiful stuffed Cheshire Cat or Cinderella snow globe at the end of the day, you can always go back to get it. That way you don't weigh yourself down with purchases until you're ready to leave. If you're a Disney hotel guest, you never have to carry off your purchases—Disney stores will deliver your merchandise to your room for free.
Of course, your best bet is to wait a couple of days before you buy anything; survey the scene a little before spending all the money in your budget. Better yet, save shopping for the last day of your trip. Just be careful with souvenir-hungry kids. Many attractions exit directly into gift shops. Even if you put your kid on a strict budget, he may be overwhelmed by the mind-boggling choices at hand and be completely unable to make a selection. If you return home and realize that you've forgotten a critical souvenir, call WDW's Merchandise Mail Order service at 407/363-6200.