try using interactivebrokers 1$ trades and u can trade basically any instrument with them, currency commodity bonds stocks derivatives etc.

If ur looking to do short term to mid term trading I would look into trading Forex cause u get great leverage and they are highly liquid. 

I used to trade stocks for a hedge fund, but have been focused on Bitcoin mining, exchange, trading, arbitrage, among other aspects of the Bitcoin economy.

Bitcoin profits vs stock market profits are massive in favor of Bitcoin.  as for marijuana the most profitable thing to do is invest directly with  a good grower and sell it yourself, it doesn't seem that's what you're looking to do though...

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