Poison. It was a common used method to get rid of important people back in the days. This is because they couldn't trace down the perpetrator! Also did you know that the leaves of tomatoes are actually toxic!
The Poison Ejector is a dropper that spits out poisonous bubbles that has $200 value. This dropper is special because it drops 2 ores at once, but it does take 5s for them to drop.
This dropper can be very effective at lower stages. Consumes 5.12kU.
This dropper can be upgraded to the Poison Fountain