Just purchased the "12th" stable slot myself, costs 1m, and I can see the next one being 5m.
17:25
+6
ヾ(✿ﾟ▽ﾟ)ノ
10:15
Changed the Myconic requirement from lv16 to lv17 after confirming with 2 people that Yoy didn't talk to them at lv16, but lv17 Myconic.