3DS/GeoMagic have now combined all three levels into a single high-end level - GeoMagic Design. Alibre Design Express hasn't existed (or at least been updated) for several years now, though 3DS is marketing low cost 3D CAD programs in their Cubify line which is derived from the lower level Alibre products. It's being marketed for their 3D printing products and runs around $200 or less depending on version.