Expense ratios are being slashed by top providers. iStock By Ryan Ermey, Associate Editor From Kiplinger's Personal Finance, June 2017 ETF providers are slashing expense ratios, and Charles Schwab leads the pack in the race to the bottom. The broker’s 21 exchange-traded funds are among the cheapest available. Plus, if you’re a Schwab brokerage customer, you can invest in the ETFs commission-free.See Also: 25 Best Mutual Funds for Low Fees Guide to Scoring the Best Deals in 2017 Costco vs. Sam's Club Best Tools to Save on Online Shopping Surprising Perks From Your Credit Card Best Time to Buy Big-Ticket Items Get a Cash Bonus for Opening a New IRA Trim Your Mortgage Rate With a 'Nonbank' Update Your Bathroom for Less Top Tech Bargains of 2017 Save Big on Exotic Travel Save on Air Travel Start with Schwab Broad Market ETF (SCHB, $57), whose portfolio of about 2,000 stocks covers 95% of the U.S. stock market. The fund charges 0.03% annually, making it the cheapest U.S. stock market proxy around. For foreign exposure, try Schwab International Equity ETF (SCHF, $30), which charges only 0.06% annually and tracks more than 1,100 stocks in 24 developed countries. For a bond fund, consider Schwab U.S. Aggregate Bond ETF (SCHZ, $52). With an expense ratio of 0.04%, it’s the lowest-cost way to track the Bloomberg Barclays US Aggregate Bond index. The fund yields 2.4%.