Exhaust Heat Shield - Rattle

Apparently my heatshields are rusted and causing a nasty rattle. I haven't been under the car yet as I only found out what they were and I am away from home for the next few weeks.

Can anyone tell me if they can be replaced separate from the exhaust system and how much they cost.

Alternatively can i just get rid of the ones that are causing the problems or even fix it?

Cheers in advance

easy fix. big jubilee clip round the offending item and tighten untill the rattle stops