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Are 'per trade' fees charged on every order or just once per stock?
In my experience they charge you coming and going. For example, if a brokerage firm is advertising that their commissions are only $7/trade, then that means you pay money to buy the stock, plus $7 to them, and later on if you want to sell that stock you must pay $7 to get out of the deal.  So, if you want to make any money on a stock (say, priced at $10) you would have to sell it at a price above $10+$7+$7=$24. That kind of sale could take a few years to turn a profit. However, with flat-rate fees like that it is advantageous to buy in bulk.