I'm confused myself, as I don't have an order there. They should tell people if they're changing the price. Anyway, the info I have from another forum-
"Just a warning for anyone who's pre-ordered the PS3 version from Shopto -- they've sneaked the price up to £37.99 just as they're about to despatch them, which also affects your pre-order price. Comes as absoloutely no surprise to me that those cunts would pull such a cheap trick to scam people out of more money."
"They say on their site they'll inform you beforehand and give you an option to cancel your order, but I've had nothing from them, and my pre-order is sitting there at £37.99 currently."