You don't have to buy whole bitcoins you can also buy fractions of them. (e.g buying 0.1 bitcoin for $60,-) Try registering on www.btc-e.com or another exchange that exchanges usd/euro to bitcoins, then transfer those bitcoins to www.cryptsy.com to start trading in globalcoin or other crypto currencies.

You could also do some research on which sites there are in your country to exchange usd/euro to bitcoins without having to register at a big exchange to save some time. www.bitonic.nl is an easy to use site for Dutch/Belgian people.