TD Ameritrade has a lot of Vanguard ETFs on the no fee list as well.
I really should get around to moving mine from E-Trade to somewhere else. E-Trade was the first no-maintenance-fee one I found with a Roth option at the time, but knowing what I know now, the Roth option is pretty much worthless to me anyway. Plus everyone seems to offer it now.
Not sure why Vanguard's is so relatively shitty - I once asked after making an IRA recharacterization about also moving the soloK there, and the rep's first word was "really?"