Please list the software and its retail price which can carry out the
following task. Creation of a 3 dimensional image by combining 2
dimensional pictures of a sliced object.  For example: a hard-boiled
egg. The picture of the cutting surface of each slice will be taken
and the thickness of each slice (for example, 20 mm) will be provided.
I need software which can combine all the 2D slices and give me the
original egg in a 3D transparent form. The software should be able to
show the position of the yolk, the volume of the yolk and the volume
of the whole egg. The 3D image can be rotated using a mouse (like the
protein molecule shown in Cn3D
http://www.ncbi.nlm.nih.gov/Structure/CN3D/cn3d.shtml). Thank you.

That could be easily modeled with almost every 3D modeling software,
using this classic process:
- importing the images (jpeg, targa...) into projection or image
planes. Normally one on the XY plane and other on the ZY plane. In
your case you'll need to import them in only XY planes and use the
slice distances as point separation into the Z axis.

- Then apply some transparency to the image planes (Normally it's a
global setting) (Or adding a 50% alpha channel to each pic in
photoShop)

- Then create a nurbs sphere, and start manipulating the vertices
until the model reaches the shape in the image planes.

- I'm familiar with Maya and you can apply some x-ray view to the 3D
models, to model stuff inside without hiding them.

Then the software can calculate the volumes of each part.

I recomend Rhinoceros http://www.rhino3d.com , because it is very
simple to use and cheap :) $195 for students or $895 retail.

If you don't want to model it by hand, then you can buy VolView
http://www.kitware.com/products/volview.htm . To convert the 2D slices
into a 3D model

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Pricing

VolView 2.0 License 
 
1 for $2500 ($1875 academic)
2 for $4250 ($3200 academic)
3 for $5625 ($4200 academic)

includes:
  90 days of technical support all patch releases for VolView 2.0

OR

1 for $3400 ($2550 academic)
2 for $5780 ($4350 academic)
3 for $7650 ($5710 academic)

includes:
  1 year of technical support all patch releases for VolView 2.0 1
year of   VolView upgrades