Actually, most brokers are commission free for NYSE and NASDAQ stocks. OTC stocks are another story and for most brokers you have to go digging to find out.

I have accounts with TDA, ETrade, IBKR, Schwab and Fidelity. Fidelity is the only one left that charges no commission on OTC trades. Tradestation seems to be OTC commission free, but only up to 10,000 shares per trade. Robinhood won't event let you trade OTC stocks (which is funny to me with the whole gamification thing they have going on).

Stock Broker comparisons
https://www.bankrate.com/investing/best-onlin...k-trading/
https://www.nerdwallet.com/best/investing/onl...ck-trading
https://www.fool.com/the-ascent/buying-stocks/
https://www.stockbrokers.com/compare
https://www.forbes.com/advisor/investing/best...e-brokers/