Cheap transport from Barcelona to Montpellier/Nice

Cheap transport from Barcelona to Montpellier/Nice via Carcassonne, as the title suggest´s I´d like to go from Barcelona where I am now to Nice, but I fear 7 days wont be long enough given my productivity to date.

Does anyone know if there´s any cheap trains or buses from Figueres to Narbonne then Carcassonne.
I really want to see all the old Knights Templar stuff up there but I´d also like to see a bit of Perpignan on the way too if thats possible.
I´ve looked at trains but its hard understand a lot of it on the internet because of the language barrier but also it would cost a lot to keep stopping at all these places. Maybe a bus you can jump on and off where you like (Expensive I think, but nothing like 80 Euros a stop for a train)

Thanks in advance everyone.

I can't help you with the Carcassonne bit, but there are trains from Barcelona to Nice - with a change in Toulouse. It only takes about 7 hours and the trains and fares are good. There's no need to use an agent - you can get your ticket at Barcelona station ticket casas.... Easy. Expect to pay (outside of peak time) around €30-40 one way.

gatman, there should be a Eurolines agent in Barcelona who could advise you with regard to cross-border coach services, but note that Eurolines is not licensed to carry passengers on domestic journeys within any one country.

With regard to rail, it may not be the cheapest option, but it is certainly the most convenient, although most cross-border journeys involve a train change in Portbou or Cerbère.

Both RENFE and SNCF have their sites available in English, however the kind of hop-on, hop-off pass you are looking for probably doesn't exist, except possibly within either country. You could try Rail Europe, but again I doubt that it would do this kind of pass?

Incidentally to see the Cathar Castles in Languedoc, you will need to get a bit off the beaten track, where there is no public transport. Carcassone is easy to get to by changing trains at Narbonne, where if you need somewhere to stay I'd recommend Will's Hotel, which is quite reasonably priced.

I see. Well I´m off to Figueres today so hopefully I´ll be able to find something from there onwards but thanks for all your advice everyone, I´ll still be online every so often so if anyone has any further words of wisdom I´d still love to hear. I will stay in Carcassonne if I can, rather than Narbonne, but thanks for the heads up anyway mate.

Cheers again