If I could upvote for more chocolate, I would. Subeta is GREATLY lacking in chocolate, despite having an entire candy store. What's up with that.
I want to add that it's fair that Black Candy Bars are rarer than Oofa, because Oofa have a CHANCE of bringing you closer to the achievement, while Black Candy Bars ARE gonna bring you closer to the achievement.
You need to roll RNG twice to get a successful Oofa, while you only need to tempt the random gods once to get a successful Black Candy Bar.