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Micro-investing: How to effectively invest frequent small amounts of money in equities? 
In terms of building the initial investment using some kind of mutual fund, I'd suggest you see my answer to this similar question https://money.stackexchange.com/questions/9943/cheapest-or-free-online-broker-for-beginner For buying individual stocks later, you could look at sharebuilder, or a low cost broker, however most of them charge between $5-$7 per trade, and if you are doing small dollar value trades then that can really really eat into things if you try to trade a lot.