Take a look at
this thread as it describes a newer device which offers more features.
There's also
this ebay seller who regularly auctions similar units which seem to get to around £40 but like other German sellers doesn't take paypal so is difficult to deal with. Also it seems they do two modules, one which opens/closes without the need to hold the button in, and another which increases the speed at which you can operate the roof.
I'm very happy with the Conmatic/Pugmatic I bought, a shame they're not still being sold easily in the UK. You could try getting one from the Netherlands
here where the unit I bought seems to be available for about £90.