Well I can't speak about the RS3 side anymore as I too left that in the dust. However, you can't really sell both together it's either one of the other. But, as for OSRS you're looking at upwards of the $200's.
Also i'd be willing to buy this for a bunch of microsoft keys if you'd like. You can pick which ones you'd like as i'd be willing to throw $400+ worth of keys your way for it. If you want to have a look at them: http://www.sythe.org/software-sales/1787519-microsoft-keys.html
This is an honest offer so please don't think i'm wanting to use your thread for anything else.