I'm tossing around the idea of writing a stock trading software in my spare time just for poops and hahas. I've got a program already in C# that will scrape the HTML for the current price (currently from google, but can be modified easily). I know it's much better to grab straight from a feed, but parsing HTML is a good start at least. My current question is is there a preferred way to buy/sell without a transaction fee? I'm sure I could use a site like E-Trade, but at $7 a transaction, that essentially punishes diversity and reduces, or eliminates, any profit. Is there a feed of some sort that I can use to buy/sell without any transaction fees?
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