Premarket scanning software - best??

Folks -
New to the market - using Ameritrade account with their add-on Level II etc.

Looking at other options - all very pricy by comparison.
Most importantly - what software gives the ability to find premarket equities meeting certain conditions.
For example - list of stocks that gapped up or down more than $1 in premarket activity

Any recommendations??
Is it possible to do this with Tradestation? eSignal?
Others for a new trader....???
Thanks
Rob
 
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