The t-shirt deal of the day over at RIPT Apparel is called “Dark Lord Happy Hour,” inspired by the dark lord villains from Star Wars, Harry Potter, and The Lord of the Rings.

The tee, by artist spacemonkeydr, went on sale at RIPT today, Tuesday, March 29, 2011, at midnight CST, and will continue for 24 hours from then, and once it’s over, it will not be sold on the site anymore.

The t-shirt is available in men’s and women’s sizes for $10 each in black. Kids sizes are $15 (Boys, Girls, Toddler in black); Onesies are $18 (in black). You can also get the design on a Hoodie for $38 (in Men/Unisex sizes in black).

Qwertee is currently offering a Harry Potter-inspired t-shirt called “Gryffindor Quidditch,” by artist spacemonkeydr.

The limited-edition t-shirt is £8/€10/$13 and ships anywhere in the world. The shirt will be on sale for the next three days and once the sale is over, the shirt won’t be sold on the site anymore.

The Harry Potter-themed red shirt has gold writing in an athletic-style tee. This limited-edition shirt is for the Gryffindor quidditch team, est. 1092, and is for the team seeker, and has the golden snitch in the center.

The $9 t-shirt deal of the day over at Teefury today is the Harry Potter-inspired “House Pride” by artist spacemonkeydr.

The sale at Teefury began at midnight EST (Sunday, January 2, 2011) and will continue for 24 hours from then, and once it’s over, it’s gone from the site forever.

This is a black shirt with green writing in the style of those Abercrombie & Fitch athletic tees. This limited-edition shirt is for the Slytherin quidditch team, est. 1092, and is for the team captain, and has a snake in the center.

The limited-edition t-shirt is available in Men’s (including 2X) and Women’s sizes.