Amazon has Seasons 1-4 of How I Met Your Mother for $60 with free shipping. If I didn't already have 1-3 I'd be all over that!
Amazon also has Uncle Buck on DVD for $2.99. They also have several other DVDs on sale from as low as $3.49. Shipping is free with Amazon Prime or if you spend $25 or more.
Burn After Reading $3.49
The Family Man $3.49
You've Got Mail (Deluxe Edition) $3.99
The Princess Bride (20th Anniv Edition) $3.99
The Devil Wears Prada (WS Edition) $3.99
Heathers 20th High School Reunion Edition $3.99 (LOVE this movie!)
The Other Boleyn Girl $3.99
Casino Royale (2-Disc FS Edition) $3.99
The Jane Austen Book Club $3.99
The Patriot (Extended Cut) $3.99
American History X $3.99