You're very backwards with your questions. Windows 7 is currently the best gaming system, OSX is probably one of the least gaming-oriented operating systems, and buying a Mac for gaming is neither cheap or practical.
If you want to play the latest and greatest building your own gaming PC running Windows 7 will cost you about $800-$1200, buying a Mac will cost you about the same, but very few games will be compatible with it.
If you expect a mac to run your games, you're probably what stuck-up gamers would call a "casual gamer" in which case you can get a decent PC running Windows for about $300-$450 that'll play most games you'll need to play. A $300 pre-built PC will run just about any game I'd expect a Mac to.
No. Any machine that is capable of running Windows 7 is equally capable of running Linux; thus virtually every computer is "Linux ready." Depending on your specific needs, Linux can be run on far less powerful and cheaper hardware than Windows 7 can.
Some software you might need to use for business may only be available for Windows, since it has the majority share in the computer market. However, you have to be careful, because you need to update your security regularly. It may also be cheaper to use computer, which use Windows OS.
There is a trial which is free, but the actual version will cost you. However, it is a lot cheaper than Windows 7, and is even cheaper is you upgrade from Windows 7.
Microsoft does not offer free copies of Windows7. If you already have Windows XP or Vista, you can buy the cheaper upgrade version (119.99 USD) instead of the full (199.99 USD) version. However, your school or employer may subsidize Windows, making it cheaper, or free.
Windows is compatable with more widly-used software and cheaper
They are typically cheaper because there are very few, if any windows, and they are more susceptible to flood.
Compaired to macs windows are a little cheaper but macs are WAY better
A 15" Macbook Pro computer from Apple would be a smart purchase if one enjoys using Apple products. If one just wants the cheapest computer available them Windows system will be much cheaper.
are computer phones cheaper than land line ones?
Yes, buying a computer and upgrading yourself is usually much cheaper, and fun!
any ford dealer will get you a computer. cheaper if you try a wrecker
It all really depends what is on the computer. If the computer is just really basic then yes it will be cheaper but if it has a lot of stuff on it then no it will still be costly.