A bunch of us have been taking advantage of this over at the blu-ray.com 3d forums. I have 2 Big Lots relatively close to each other, and I've gone 2 weekends in a row once and still found several new 3d blu's the second weekend! They keep getting new stock it seems pretty regularly and different ones between them as well.
I've gotten so far among others I forgot:
Turbo
Terminator Genisys
Mr. Peabody and Sherman
TMNT
The Spongebob Movie
Kung Fu Panda 1+3
Star Trek: Into Darkness
Kubo
Hercules
Dragon Nest
Madagascar 3
Cars 3
A few of these I got during B1G1 50% off and several were marked down to $2.50
I've also seen Dredd, Star Trek Beyond and more.