The employee in question told GamesIndustry.biz she was unhappy about a campaign offering pre-owned games at prices "cheaper than your girlfriend".
She said: "It is pretty openly sexist - girls being cheap, obviously, but it's also pandering to the old stereotype that gamers are guys. And of course any discrimination is banned by GAME's own employee regulations, so I don't see why the company itself should be able to get away with it."
GAME's PR department responded to the accusation of sexism with the following statement.
"We welcome everyone into our stores and the Gamestation brand reflects its customer base which is still predominantly the traditional core male gamer. Our marketing and in-store POS does, and will continue to, appeal to that audience.
"Throughout its existence, Gamestation has always been slightly edgy and occasionally controversial. Our customers love this about us. Whether they agree with everything we do is a different matter."
It added: "We embrace people's right to disagree and you will see this in our stores every week as our customers and staff discuss, usually passionately, the finer points of the latest games."
Personally I was more shocked by the price of the game