Assuming they're all using HDMI, some options:
1. If you have some inputs of other types available on the TV (e.g. component), move one of the devices to another input type (preferably component so you don't lose significant quality).
2. Get an HDMI switcher to allow you to have more than one device hooked up to the same HDMI jack on the TV.
3. Get an A/V receiver that will switch sources for you and only need one HDMI port on the TV. This is a significant investment, and you'd need to buy speakers too, but it would give you much better audio quality too. If that's something you've been considering, now might be a good time to take the leap.