They stopped making them. A couple of years ago, I was visiting my dad in South Carolina and picked up a bag of these, and they were fantastic. Totally NOT the original Taco Doritos, but almost - ALMOST close to it. Paled in comparison but still. I bought a bunch of bags before returning to New Jersey, then through this site I hooked up with a bunch of people that wanted them too. My dad had to chase down the Tom's truck driver but he worked out a deal and bought several cases for friends here on the forum.
However, I don't believe they are being made anymore. You can't find them even on their website.