ThinkOrSwim is now Ameritrade so not sure those deals exist any more. IB is a good choice or any per share broker with such small size. Suretrader is another option as offshore brokers are not subject to the $25k rule and they offer 6:1 leverage - but they have some customer service issues.
Also, ThinkOrSwim/Ameritrade has fairly good data/charting so it might be worth funding a small account with them just for the free platform even if you use someone else for the daytrading.
Also, ThinkOrSwim/Ameritrade has fairly good data/charting so it might be worth funding a small account with them just for the free platform even if you use someone else for the daytrading.