Any idea where to get and how to install vibration isolators?

We rent an apartment in an old house with a busy truck route in front of it and neighbours that tend to slam doors. We manage to block street and TV noise with ear plugs but when a truck drives by or a house door slams (which happens pretty frequently) our bed vibrates making it impossible to get a decent night's sleep. We saw a yahoo post where someone suggested vibration isolators for the bed but we don't know where to buy them or how to install them on the bed. We have a metal frame and metal head and footboard. If anyone knows how to do this or has other ideas for blocking the vibration noise, please please reply!!!! Thanks.