Buying Mech Warrior 3 on-line
 

There are many sites to buy MW3 online.  The one that Microsoft use is Electronic Boutique..  I haven't checked them but I think they sell in different countries.  If you use your local search engine you should be able to bring up software retailers close to you that sell MW3.

System requirements:

Windows 95/98
Pentium 166 
32MB RAM 
640 x 480 Screen
16 bit 2MB video RAM
2X CD ROM
240 Mb free hard disk space
DirectX compatible sound card.