cd-r is a definite no no.
Can you elaborate on what alternatives we have for printing a small run of discs? It is unlikely there will be enough interest in a boxed copy to justify getting actual pressed discs made.
Minimum order of pressed disks seems to be 300 and fewer than 20 backers want them :(
still it's only $700 bucks or so, and those tiers donated $1200 (or more)
this doesn't leave mch money for the box itself though.