Disagree. I've never seen Amazon itself sell LEGO above retail price. They just tend to run out of stock, so they don't actually sell many sets. Third party sellers often do up charge, but that's basicaly like buying on eBay.

OTOH Toys R Us will definitely sell above retail. Set 60057 is $17 at Amazon, $20 from Lego, and $25 at TRU.