This is an opportunity to ask them to donate to a charity on your behalf, if they absolutely must get you something. Or you can ask for something less tangible,

This is an opportunity to ask them to donate to a charity on your behalf, if they absolutely must get you something. Or you can ask for something less tangible, like a board game night or something. This doesn't solve the problem of you being expected to get gifts, but it does give you a productive way to direct other people's energies.