P2s first came out with ahead steerers in 1997, when they were gunmetal grey and the problem is that only one bike had triple-butted as standard, the Kilauea. I think the were an option on the Cinder Cone, but the Lava Dome had pg P2s. Then by 98 (when they were black), no bike had triple-butted P2s as standard, although they were an option on the Cinder Cone and Caldera I think. However tb P2s were sold in decent numbers as aftermarket upgrades (often fitted to makes other than Kona), so they might make up the bulk of what you can find on eBay.
With all that in mind, I think if you are patient in watching eBay, you will find plain gauge P2s reasonably plentiful, especially if black is ok. Triple-butted I agree is rarer, but not all that rare I don't think.