How does your NBBO guarantee work?

TradeKing guarantees that each order is executed at the national best bid or offer (NBBO) on market or marketable limit orders.
We demand the NBBO on every executed order and we will reimburse your commission if we do not get it.
Not all orders are eligible for NBBO treatment. Some of the non eligible are stop orders, advanced orders, limit orders not entered at the current bid/ask, orders during "fast markets", orders placed at any exchange which designates that it is temporarily not eligible for NBBO treatment, and those entered for opening rotation.