Hi, I am going to implement a scalp trading, and I think my current IB unbundled commission may be too high. I am thinking if any broker provide a fixed amount of commission for unlimited trading, for example $1000 per month, plus I can also get rebate if I provide liquidity and pay when I remove liquidity (since my order is limit order, so I want to get the rebate). If you know such brokers, please let me know. Thank you very much.