@ojmason@secboffin If you've already purchased it, it will still be in the "purchased" tab in the App Store for re-download.
However I'd recommend Felix over Netbot anyway. It's the best ADN app out there. Riposte is also very good.
@manton@secboffin it's interesting that they still sell Tweetbot... I wonder if Twitter's developer incentive program (hahahahahagahahahahah). Still, not a lot of money in A•n going forward, I suppose.