You could always get involved in stocks via DRIP programs. You could start off with your amount of money and just put it in each month. I would suggest that you do 3 separate drips $100 each and make sure they are in different industries. Make sure you read the information and get an understanding of any fees. Some will charge a small amount to reinvest some won't.
For a listing of DRIPS with no fees, I recommend:
http://www.directinvesting.com/search/no_fees_list.cfm
I don't agree with either of the recommendations put forth by dude or tarheelblue86, because the fee % is heavy and it's hard to overcome with such a small investment point. At least with DRIPS you will dollar cost average your shares and if you get into stocks that pay dividends you will see your portfolio grow nicely. There's a lot of solid companies out there that offer these plans.
Just make sure you pick 3 companies in different segments of the market. Don't put them all in retail, financials, etc. This way you'll be well diversified and can withstand some hits and when the tide is high you'll make out nicely.