Low Budget CFD Software

While searching for low cost computational fluid dynamic software for
calculating the drag coefficients of rocket vehicles I found
<http://www.aerorocket.com/> http://www.aerorocket.com

 

Have you ever used VisualCFD or HyperCFD? Do they work and provide
usable results? Do you know any other low cost software (<$250) for
determining the drag coefficient vs. Mach profile of rocket vehicles?

 

Thanks for your help,

Jens Lerch