Cobra and Centerpoint charge commissions. TradeZero does not in the US for stocks > $1 except for orders placed from 4am to 7am. In addition, TradeZero offers its clients our patent pending short locate platform that allows traders to “mark their locates for credit” allowing TradeZero to reallocate your locates to another TradeZero client, you can recoup a portion of your initial locate cost.. https://tradezero.us/locates/