These businesses are likely to get a whole lot bigger and more valuable in the years ahead.Investing in growth stocks can be an easy way to increase your portfolio's value over time. While dividend stocks might seem safer and can offer recurring income, stocks focused on growth can generate more significant returns in the long run.And if you're looking for promising growth stocks to buy for less than $100, there are many options to consider, including Walmart (WMT -0.82%), Starbucks (SBUX -1.82%), and Shopi ...