I have read that VTSMX is a pretty tax friendly fund do to low turnover so I opened up a new account at TD Ameritrade where I also have a Roth IRA and threw $15k in there to start with the plan to add about $1-2k a month moving forward. The problem seems to be that TDA is hitting me with a healthy trade fee because it’s a Vanguard fund. I read that in this case it’s better to go with the VTI ETF because it’s pretty much the same and doesn’t carry the mutual fund fee however unfortunately it is not a commission free ETF so I think I will get stuck paying a commission each month.
Is there a Comission free ETF at TDA that meets my needs or should I open a new account at vanguard if I want to use their fund? I know there is no free lunch, just looking for a cost effective lunch

Thanks in advance for any advice!