There currently seems to be a sale on the Grand Theft Auto: San Andreas remaster released today for Xbox 360. The announcement said the game would be sold for $14.99 On Demand in the Marketplace, but the North American marketplace on the console, website, and mobile site all are selling the game for $3.74. I've had success on the mobile site, and I don't know if the price shows on other marketplaces around the world. I've just head the USA and Canada. The price has been this low for an hour before this post.
Edit: It may just be an anniversary sale, as this source says the UK price is £2.99.