Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can I buy only 4 shares of a company?
The least expensive way to buy such small amounts is through ING's Sharebuilder service. You can perform a real-time trade for $9, or you can add a one-time trade to their investment schedule for $4 (transaction will be processed on the next upcoming Tuesday morning). They also allow you to purchase fractional shares.