Every day, Amazon offers up “Lightning Deals,” limited quantities of various products for a discounted price for a 4-hour window of time. You have to be on the lookout for these deals and once the item runs out within that four hours, the sale is over.

Meaning, if you see something on sale that you want, buy it immediately before it’s gone.

Typically you don’t know what will be on sale until the minute it gets posted, but as a prelude to Black Friday, Amazon has released today’s Lightning Deal schedule for Movies & TV on DVD and Blu-ray. See list of today’s deals here below, along with more information on how these special deals work.

MONDAY, NOVEMBER 22, 2010

4:30 a.m. – 8:30 a.m. PST

Up in the Air
DVD – $6.99

The Men Who Stare At Goats
Blu-ray – $8.99 | DVD – $7.99

The Ultimate National Lampoon’s Vacation Collection
DVD – $13.99

8:30 a.m. – 12:30 p.m. PST

Twilight Saga: New Moon
DVD – $8.99

Twilight
DVD – $5.99

Gossip Girl: Season 1
DVD – $13.99

12:30 p.m. – 4:30 p.m. PST

Curb Your Enthusiasm: The Complete First Season
DVD – $13.99

Live Free Or Die Hard
Blu-ray – $5.00

Prince of Persia: The Sands of Time
Blu-ray – $9.99

4:30 p.m. – 8:30 p.m. PST

Hot Tub Time Machine
DVD – $7.99

She’s Out of My League
DVD – $6.49

Studio 60 on the Sunset Strip: The Complete Series
DVD – $11.99

8:30 p.m. – 11:30 p.m. PST

Friends: Season 1
DVD – $9.99

Friends: Season 2
DVD – $9.99

Friends: Season 3
DVD – $9.99

Friends: Season 4
DVD – $9.99

Friends: Season 5
DVD – $9.99

Friends: Season 6
DVD – $9.99

Friends: Season 7
DVD – $9.99

Friends: Season 8
DVD – $9.99

Friends: Season 9
DVD – $9.99

Friends: Season 10
DVD – $9.99

Note – the discounted price won’t appear on the product page, you have to put it in your cart to see the sale price.

FYI – Today’s Video On Demand rental deal is Dorian Gray starring Prince Caspian‘s Ben Barnes and Colin Firth for 99 cents. Deal is only for today until midnight PST.

Per Amazon:

Lightning Deals have a limited quantity at the prices listed below, so it helps to move quickly if you see something you like. You now have a limited time to purchase a Lightning Deal after it has been added to your Cart. After you add the deal to your Cart, you will have 15 minutes to make the purchase. You will be notified by an alert that will display in the upper right-hand corner of the page when you have 10 minutes remaining to make your purchase. You must check out within this timeframe to receive your promotional discount.

If you have not purchased the deal before the time runs out, the discount will no longer apply to the product in your Cart and will be available to other customers who are interested in the deal. If quantities run out, you may apply to be waitlisted for that item.