Blogger Coffeewithgames recently noticed that Amazon US had stopped stocking Metroid Prime Trilogy a few weeks back. He fired off an email of enquiry to Nintendo about the status of the title and got a response from Nintendo.
"Unfortunately, Metroid Prime Trilogy is no longer being shipped. Having said that, you may be able to find what you seek through the secondhand video game market."
Some further probing was done to confirm the reasons behind why it was being discontinued. When the game was first announced, Nintendo did say that it would be available on a limited basis, but could not provide a reason why. The other New Play Control titles are not subject to this discontinuation however and Nintendo continues to develop and ship those titles. It's not known if other regions are affected by this as of yet, but we'll certainly let you know if we're able to find out anything on the subject.
The limited availability likely has something to do with the steelbook the US version of this collection comes packaged in. There's no mention of an alternative release nor of more "New Play Control" titles, so if you're hankering for some Wii Metroid action now might be a good time to snap up a copy while you still can!