Alternatives to DVD changer?
 

Hi I've been looking into installing a DVD changer in a E70. So far I've not been able to find an original BMW DVD changer that is in the glovebox and don't really want to pay the best part of £1000 or $1700 for it.
Was wondering whether anyone knows of any other DVD player/Changer that can be used in place of it and would still allow full control using the idrive buttons and display on the nav screen?

Would appreciate the help!!

Thanks