Noise traveling through the electrical circuit

[amuro73]

I need an affordable solution for cleaning up my power supply. My monitor is constantly buzzing, and I can hear other things plugged into the circuit -- for example, when the washing machine is going, the monitor has a buzz corresponding to the washer's spin cycle. My laptop's power supply also sends out hard drive noise into the circuit as well.

Any good power conditioner/filters that can solve this problem? Ideally for <$100?

Thanks!

ari