It is possible to buy a cheap server from PCWorld. That is because a server can be a high specification PC and also because PCWorld do have a a section dedicated to selling to businesses.
try ebay/amazon
Some tablets are 80$ some are 400$, ipad is 600$. You may buy cheap tablet pc at crvc11.ecrater.com
Steam is the best place to buy games online its safe and cheap. If you want to buy a hardcopy of a PC game, there are several online game shops where you can buy PC games. You can find a list here: http://gameshopguru.com/?s=PC
A cheap Dell PC can be purchased used at local computer store, Dell stores, Best Buy, and some pawn shops. You can also find cheap Dell PC's online on sites like eBay and Amazon.
Sell the PC to a junk dealer and buy new PC
Many of the department stores have these for sale. Bestbuy is a good place to go for a cheap PC controller or also Costco. Some companies produce controllers which aren't brand name.
You can purchase an LG PC Suite at Best Buy, Staples or CompUSA. You can also purchase an LG PC Suite at an online retailer such as Amazon, Ebay or Nextag,
buy a new PC
According to wikianswers.com you can buy a new pc from 400 to 700 hundred it all depends on what you want on them.
Have you checked ebay? I've seen some going for £4 :)
Sadly, it is no possible. PC games are made only for PC. You must buy the Mac version of your game to play it on the mac.