Best night light for a 2 year old scared of the dark?

My daughter will be two in March, and I believe she has entered the phase of being scared of the dark. She’s having nightly wakings where she can’t get herself back to sleep and just looks scared when I go in her room. We have a mobile with lights and sounds, but it only stays on for so long before shutting off automatically. Also, the battery life isn’t worth a crap. I’m preferably looking for something that plugs into the wall and stays on all night. But, I don’t want to spend an arm and a leg on it. What night light do you use for your 2 year old that actually helps them fall asleep and stay asleep??