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.

GOLD BOX DEAL OF THE DAY [valid only for today until midnight PST:

Harry Potter Years 1-6 Giftset
DVD for $23.99 | Blu-ray for $39.99.

TUESDAY, NOVEMBER 23, 2010

4:30 a.m. – 8:30 a.m. PST

The Runaways
DVD – $8.99

Mamma Mia! The Movie
DVD – $3.99

Surf’s Up
DVD – $4.99

The Gold Box deal of the day over at Amazon today is Harry Potter Years 1-6 Gift Set for 60% off.

The DVD is $23.99, while the Blu-ray is $39.99.

Note, this sale is only for today, Tuesday November 23, 2010, until midnight PST while supplies last.

Both sets contain the first six Harry Potter films, along with tons of bonus features (see below for full list of extras). The Blu-ray edition comes with an extra bonus disc with additional deleted scenes; cast Q&A, a profile on author J.K. Rowling, footage from Harry Potter and the Deathly Hallows, a look at The Wizarding World of Harry Potter at the Universal Orlando theme park, and more.

Harry Potter and the Sorcerer’s Stone
Harry Potter and the Chamber of Secrets
Harry Potter and the Prisoner of Azkaban
Harry Potter and the Goblet of Fire
Harry Potter and the Order of the Phoenix
Harry Potter and the Half-Blood Prince

The $9 t-shirt deal of the day over at Teefury today is the Star Wars-inspired “Lightkatana Fight” by artist AJ Paglia.

The sale at Teefury began at midnight EST (Tuesday, November 23, 2010) and will continue for 24 hours, and once it’s over, it’s gone forever.

The shirt is mash-up of Japanese katana swordplay and Star Wars lightsaber duel. One of the swordsman is the Darth Vader figure all in black with a red sword, while the other is in light clothing with the Rebel Alliance insignia and green sword, a la Luke Skywalker in Return Of The Jedi.

If you’ve yet to see director Duncan Jones‘ Moon, you should immediately remedy that…trust us.

After you’re all caught up, you can join us all in being excited for Jones’ sophomore effort, Source Code. The movie stars Jake Gyllenhaal as a man who discovers that he’s being programmed into the final minutes of another man’s life just before a bomb on a train goes off, killing many people. It turns out that it’s part of a secret government experiment to try and identify and stop those responsible for the bomb before another much larger attack is executed. He’ll have to re-live this man’s final moments over and over again on his mission, and also finds himself trying to save the life one of the passengers on the train.

Be sure to head on down below, where you can read the full synopsis for the movie and check out the first trailer for Duncan Jones’ Source Code now!

Mere hours ago, word hit the internet that Warner Brothers had acquired the rights to Buffy the Vampire Slayer, and would be moving forward on a reboot of the property based on a pitch by Whit Anderson, who is currently working on the screenplay for her take on the character.

Well, it didn’t take long for someone to get a hold of Joss Whedon, who wrote the script for the 1992 original Buffy starring Kristy Swanson, created, wrote, directed, and produced the mega-popular TV series of the same name starring Sarah Michelle Gellar, and is also responsible for things like Firefly, Angel, and Dollhouse. Whedon is busy working away on The Avengers, the Marvel comic book movie that’s been set up over the past handful of years to become one of the biggest movies of all time, which he was hired to write and direct. Nevertheless, the fanboy favorite took the time to write a response letter sharing his feelings on the new reboot, and you don’t want to miss what he had to say.

You can head on over to the other side to read the full letter from Whedon, and you should plan to giggle once or twice.