D.N.
Try a local hardware store. When my daughter got hers, I could not find a 100 watt bulb. I went to the local ACE and they had them. The guy thought I was crazy asking for it but I told him I needed it for the oven.
BTW, they are working on the Easy Bake and no bulb needed since the bulbs are going to be "extinct" very soon. I think the 100 watt goes out next year. Then the lower ones will be eliminated.