The thing everybody forgets about 3D printing is that there is no economy of scale once you've amortized the costs of building the model. However I sell things through Shapeways and I consider their pricing much too high. I can only slap a 20% margin on my things at best and remain within the bounds of sanity. OfficeWorks in Australia charges $15 for 15 minutes, again too high. But it's mostly human intervention of course.
However you don't need Shapeways or Tek production quality on these. They only have to hold the side on for opening once a year, and they only need to be considerably better than the sticky tape we've all been using, which isn't hard.
I can print 10 on my $200 home 3D printer in under an hour. As a service to Tek group members I'm prepared to do so for $15 per set of 10, as long as people don't mind removing a bit of stringing and trimming and tolerating a maybe 10% failure rate. Heat gun or hair dryer requried for assembly. Postage from Australia 3182. Don't all shout at once please ;-)
EJP
