Never use a "Market Order" for penny stocks. Prices move too fast; a limit order ensures you don't pay more than you intended.
Most brokers (like Fidelity) require you to "opt-in" and sign a disclosure before they let you buy sub-$5 shares. How much experience do you have with the stock market? where to buy penny stocks online free
Similar to Robinhood, it offers a slick mobile interface and zero commissions for exchange-listed penny stocks. What You Need to Know The Two Types of Penny Stocks Never use a "Market Order" for penny stocks