Advanced orders for National Treasure 1 & 2 combo pack on Blu-ray spiked at Amazon.com on Sat. upon availability at the retailer.

National Treasure 1 & 2 held a 800 percent spike in sales to rank as the No. 8 product in the Movies and TV division on Thurs.

The two-pack is selling for $39.99, below a list price of $69.98.

Warner Bros. I Am Legend Blu-ray disc ranked as the No. 1 top DVD seller at Amazon this week after a discount to $18.95.

Retailers this month are offering sale incentives to drive the Blu-ray disc format to customers.

Amazon.com this month fired a new Blu-ray disc sale that discounted titles up to 47 percent.

Titles in the new sale include Casino Royale, First Blood, Curse of the Golden Flower, Transporter 2, and A Knight's Tale.

Additionally, Amazon this month began offering a Big DVD sale starting at $6.49 per title.

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