There's no minimum to invest. Just sign up, link your bank account and enjoy the savings. Getty Images By Ryan Ermey, Associate Editor July 6, 2018From Kiplinger's Personal Finance Guide to Scoring the Best Deals in 2018 Disrupter Deal: The Instant Pot Get the Real Deal for Less Best Bets for Grocery Delivery Top Tech Bargains for 2018 Refurbished and Open-Box Deals Disrupter Deal: No-Strings Streaming Best Deals for Low-Cost Cloud Storage Free Trades on Low-Cost Funds Skip the Sales Tax Sales on Consumer Staples Stocks Hot Savings on Flights to Hawaii Get a Free Hotel Room RVs for a Dollar a Day Disrupter Deal: Two-in-One Trips The 4 million customers of online and mobile brokerage Robinhood don’t receive the investment research or portfolio tools offered by more-established brokerages. And no, the brokerage’s app doesn’t let you steal from the rich to give to the poor. But Robinhood does offer no-commission and no-fee trades for all U.S.-listed stocks and ETFs. There’s also a free options trading service and, in some states, cryptocurrency trading. (Robinhood’s revenue comes from selling premium subscriptions that allow after-hours trading and margin trades.) There’s no minimum to invest. Just sign up, link your bank account and enjoy the savings.