I printed out the ordering page and it stated
Items in your shopping cart will be saved for 14 days. Merchandise availability and pricing are not guaranteed.
Please also read the Terms and Conditions:
Sears attempts to ensure that the Content on this Website is complete and current. As indicated in the DISCLAIMERS set forth below, Sears does not guarantee that the information contained on this Website will not contain errors, inaccuracies or omissions. Such errors, inaccuracies or omissions may relate to price or to product description or availability. Sears reserves the right to correct any error, inaccuracy or omission or to change or update the Content without prior notice to you. Further, Sears reserves the right to refuse or cancel any orders containing any error, inaccuracy or omission, whether or not the order has been submitted, confirmed and/or your credit card has been charged. If your credit card has been charged for the purchase and your order is canceled, Sears shall promptly issue a credit to your credit card. If you are otherwise unsatisfied with your purchase, you may return it to Sears. Please see our Return/Cancellation Policy.
I've been a deal hunter for many years and this is not uncommon. For those who got in - good for you! For those who didn't - maybe next time!
BTW the market on ebay may be saturated with these tvs. lol