I ended up building my own for our bus. It's just a basic full width rock and roll bed, with a box seat that opens up next to it, so it sort of forms an L-Shaped interior. I then made my own cushions out of foam, hardboard and leatherette, as well as my own door cards.
It's definately a much cheaper option. In total all the door cards and panels (9 in total), all the necessary seat cushions (6 in total) and the actual wood to make all the furniture, cost me under £100.