How to create a unique sidebar for a post?

Hello,

I need to be able to create unique sidebars for individual posts. Does anyone know of a way I could achieve this?

Is there a plugin you use that can do this? I have searched but can’t find anything that will work.

I had been using Custom Sidebars Pro but it stopped working and WPMU Dev’s support is very poor and won’t respond to support requests.

Is there anything else I could use?

Thanks