My mom's birthday is in July, what should I get her?

I love my mom to death. We have so many fun times, and too many fights. She yells, but is the greatest mom alive. Although I ask for things and she says no, I accept and still love her. She travels alot, and I kind of wanted to get her something related to that somehow.

I always ask her what she wants for her birthday and she always says sothing. I know she wants something. For Christmas I got her a Shake Wieght. For Mother’s Day I made her bed in breakfast and gave her a coupon holder (she’s a fanatic.) She loves them both, but only uses the Shake Wieght occasionaly.

My idea was to get her a charm for her Pandora Bracelet, or a subscription to Curves. I only have about $100, and both of my ideas are expensive. Any good ideas?