My local Gamestation (Stockton-on-Tees) has some new UMD's for only £1.99 each, and they're also within the 3 for 2 offer. So I bought 3 UMD's for only £3.98! Bargain!
I got Hostel II; Legend of Zorro; and Hollowman.
Others I remember them having were Once Upon a Time in Mexico; Anaconda; Exorcism of Emily Rose, The Amityville Horror, Destination Germany, Lord of the Ringers, and a couple of others.
Just checked, and not showing online, so looks like it's instore only - hope it's not only local to my branch!