Both D&C series are aimed at Aspire users as they offer a package deal - models, scenes and tutorials. As such, all files are in .crv3d file format, which can only be opened with Aspire.
Based on some selection process, some of the models and scenes have been converted to .v3m and .stl formats and sold individually on the website.
If you have specific questions on model availability, don't ever hesitate to email them at firstname.lastname@example.org
and I'm sure they will address your questions/comments.
I understand Aspire is a lot of money, but for what you are getting it is the best deal out there. I'm not sure where you live, but if it is in any type of area where these models and scenes would be popular, it probably would not take long to justify the cost. There is so much you can do: clocks, wall plaques, retirement plaques, coat racks, gun racks, fishing pole holders, personalized boxes, etc. and the models will set them apart from the competition. Just something to think about.