I have set it up using Chatbase with the Hobby subscription which should be plenty for the use that Voicebot gets. I didn't think the free plan was quite enough.

It seems to have good customisation options and control over exactly which pages it uses as training material - I gave it the sitemap of the main Voice site and the Documentation site, and then can choose which pages to include/exclude from those. Can also add FAQs for things it misses, and it's easy to review the chats to see where it might have gone wrong.

If cheapness is the key then the Elfsight AI Chatbot Widget might be suitable for you - I had a look at it but found it wasn't very customisable in terms of what material it learns from - you basically point it at your website and it tries to figure it all out itself. You can then tweak the URLs it's trained with but it's a bit of a faff and rather manual. But it is cheap, so there's that!

Thanks

Joe