Being a recent convert my knowledge is very limited. I bought some lovely ones from moontimes. http://www.rachaelhertogs.co.uk/moontimes.shtml
They are the only organic reusable sanitary towels made in the UK and they are also fairtrade. On top of that they are produced by just a few women who are able to fit it around their children. Ethically they are very sound, but naturally this means that they are very expensive.
I was wondering which other brands of reusable sanitary towels you favour. There are such a lot out there and they all look pretty, but which ones do the job and which ones are cheap, do the job and are pretty? I look forward to your replies.