If you want to buy penny stocks despite the risks, you can do so at most major online brokerages. In order to protect investors, some brokers may impose restrictions on these transactions. Before trading penny stocks, make sure you understand all of the risks involved.

Another factor to consider when investing in penny stocks is the cost of broker fees. If the fees you pay are excessive, they may cancel out the profits you make from penny stock investments. For trading penny stocks, consider brokers such as Charles Schwab or Fidelity.

Investing in penny stocks can be risky due to their volatile nature, but if you're interested, here's a general guide on how to buy them:

1. Research: Conduct thorough research on the company issuing the penny stock. Look into its financial health, business model, management team, and growth potential. Understand the risks involved.

2. Choose a Broker: Select a brokerage platform that offers access to penny stocks. Ensure the broker is reputable, has low fees, and provides adequate tools and resources for trading.

3. Open an Account: Follow the brokerage's procedures to open and fund your trading account.

4. Place an Order: Once your account is funded, use the brokerage platform to place buy orders for the penny stocks you're interested in. Specify the number of shares and the price you're willing to pay.

5. Monitor Your Investments: Keep a close eye on your penny stock investments, as their prices can fluctuate rapidly. Consider setting stop-loss orders to protect your investment from significant losses.

Remember to approach penny stock investing with caution and consider consulting with a financial advisor to ensure it aligns with your investment goals and risk tolerance.