Be very careful when giving out advice like this as it seems like a financial advice, this particular advice has lead many to their doom in the market. Just because a coin is not expensive doesn't mean it's a perfect alternative to the already expensive ones like bitcoin etc. This same reason is why people go and invest in coins trading for just zero's of cent without realizing they're buying coins that has billions to trillions of supply circulating which makes it impossible to increase without manipulation.

When investing, consider the fundamentals of the project before looking at the price. Many projects currently listed in the market shouldn't even be tradable as they offer nothing to the industry. They're just pump and dump coins waiting on their new victims to scam.