It's the $150/month plus commissions (I use tiered). When I did it, I transferred my money from TD to my bank, and then from my bank to IB. I did the change about 9 months ago, so worth it!
I am also using Thinkorswim along with TWS for Level 2 and execution. Together they can do the job. The TOS charting is far better than that of TWS and both are free platforms that come with an account.
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