From memory this one was sort of contentious last time, but at <$7 per shirt delivered it's not terrible value …
Content, quality, style and cut of shirts vary immensely, but I got a couple of Rick and Morty ones the last time which made it worthwhile.
Available in sizes (Mens S,M,XL) (Womens S,M,L,XL) at time of posting.
From Zavvi Website:
Description
We've restocked our mystery geek t-shirt 10 pack with all new lines, so you can fill your boots and stack those wardrobes high! Featuring big name film and game franchises such as Deadpool, The Legend of Zelda, Call of Duty, Black Panther, Fallout, and more, you’re bound to get an amazing assortment of t-shirts to add to your collection!
Purchasing multiple bundles may result in receiving duplicate t-shirts
If you prefer a baggy fit, please order a size up.
How does this compare with Kmart $7 shirt?