Make super restore potions.
From 84-99 you need to make 70,759 super restore potions
70,759 snapdragons will cost you 536,140,943
70,759 red spider eggs will cost you 3,679,468
70,759 vial of waters will cost you 424,554
Total price will come up to 540,244,965
Super restore (3) costs 7,181 per vial, so that means 70,759 super restore (3) will cost 508,120,379
Deduct that from the price of the materials and you're left with 32,124,586
84-99 will cost you 32m using this method.