Saw these in my local Tesco this morning and got a pair for my boy.
£5 is a great price for a pair of Ben 10 branded PJ's, but these are 3D; how cool is that??!
Also comes with 3D glasses.
PS My local Tesco is Lee Mill near Ivybridge / Plymouth, the had three rails of sizes ranging from 4-5 upto 10-11