Redfin only charges 1% if you both buy and sell with them within a window of time (365 days if I recall from our Redfin broker). I've used them exactly once on both the buy side and sell side, and I was not impressed. I would not use them again, even with the 1% vs a more traditional 5% broker fee.
They're a bit sneaky on this one too. You pay full when you buy, but then they only charge 1% when you sell. So you only save on the sell, pay full price for the buy.