Parents are paying up to 12 times the normal price for Christmas must-have, the Nintendo Wii.
The £179.99 consoles, sold out in most high street shops, are fetching four-figure sums online.
And a net auction seller sold one at the weekend for £2,259.99.
Woolworths and Game are now only selling the motion-sensitive machines in bundles with games and controllers – at double the console's price.
Sally Hughes, 37, of Hastings, East Sussex, said: "My kids have their hearts set on a Wii. I may not have any choice but to pay hundreds of pounds over the odds."