Current Status: United States, New Zealand, and Australia: Permanent Flavor
Year(s) Available: United States: 2003, 2004, 2005 - Present
LiveWire is a Mountain Dew flavor released in stores in the summertime in 2003, 2004, and then 2005 for a limited time in the United States. During its release, it proved to be massively successful. This introduction alone increased overall Mountain Dew sales by 10% in its first year, eventually making LiveWire a permanent flavor after its 2005 limited-time run.
Mountain dew live wire
googles
This says that they restarted production, if you're in the US.
https://mountaindew.fandom.com/wiki/LiveWire
Walmart says that they stock and can ship it:
https://www.walmart.com/search?q=Livewire
Might just be that it's not showing up in local stores near you.
Interesting, I don't see it sold in stores anywhere. I'll need to look for this.