The SPY ETF is 0.0945% per year, although you still pay the broker when you enter or leave the position.

Vanguard's prices are great, especially if you get into their top-tier $10,000+ accounts. But ETFs are competitive against Vanguard in my experience.

Of course, Vanguard also offers low-cost ETFs. As long as you go with a mainstream option, I don't think you can go wrong.