Buy.com
Bait n Switch: Advertised out of stock item with instant rebate, then as soon as off sale back in stock
I've watched this company do these repeatedly! At 5am they send an email about a product at a very low price, in this case a Brother PT2430PC label printer for $27.99. A couple hours later it's "out of stock", and before the page updates it actually says it's "Not available from ...