Can anyone help me with some gift ideas?

Final exams have made me put off my holiday shopping; I have three younger sisters who I would like to get Christmas presents. However I am a full-time college student with a quite limited budget- like $30 combined for all three of them. I have some general details about them below if that helps anyone come up with an answer.

My next oldest sister is 16- very mature and sophisticated for her age, well rounded, though she loves buying herself beauty products, I can never keep up with the newest "must-have" products and they would probably be too expensive anyways

After her, my next sister is fourteen- very practical and candid, likes movies and TV, not a big reader, although I do take her out with me to "book" movies on occasion

My last sister is 10- well into her tween phase, but too cool to like tween actors and music groups, very crafty, trendy, and outgoing

Thanks for any ideas you might have and I would like to add that I want to keep the gifts relatively equal in value between them all.