It's still odd to think about The Last Guardian as a product that is now 'out'. For so long it was a mythical entity that felt like it would never be here, and we are now months past its release.
And now it's going to be even cheaper. Sony have told Polygon that the current listing for the game, $40, is now a permanent price. This means just 8 weeks after release the game is currently $20s cheaper than at launch.
This is potentially worrying, as you could well interoperate this as the game's sales not being great. That would be a shame considering how anticipated, long awaited and actually genuinely good the title is. Still, a win for more people who were thinking about picking up the game.