Ah-hah! Thank you.

Thanks, I should have been clearer that I meant I read those on the Fidelity and Schwab sites, trying to find anything that looked like an additional fee over what Vanguard itself charges. I can't find any mention of the $75 fee at Fidelity. It's not on https://www.fidelity.com/trading/commissions-margin-rates for instance. Where should I be looking to catch this type of thing?