I really like my Beyerdynamic DTX 900 headphones, but the earpads are wearing out - and are generally a lot worse for wear. Is it possible to replace these easily, or do I have to assign these headphones (sadly) to the junk drawer, and replace them with something similar or better?

If the latter, what would be a good recommendation - up to (say) £150.

In the first instance I'd like to get these fixed, if possible - the units are still working well.