Jennifer,
Try any good theatrical supply house. Rosco, Great American Market, SX and a whole host of other manufacturers make very realistic battery/electric candles for stage and film work.
Alternatively, if you have any kind of electronics shop in-house, you can make them yourselves very easily. If this is an option, e-mail me and I will point you to web sites with schematics.
Mark C. Cohen
Production Management
Technical Direction
Lighting Design
mccusa+AEA-mindspring.com