Cheapest Market maker fee's?

Hi guys,

Is there anyway, or any place that shows which MM is the cheapest per share traded?

I have been going through INET for all my trades, but I looked at my daily blotter yesterday and noticed a whopping $50 for a 5000 short I made. Was wondering if this could have been cheaper if I used say "RASH", "EDGA" , "TRAC" EDGX"

I have all MM's availible to me

Thanks in advance.
 
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