Whatever is cheapest... Try fleshy larva and something. The other cheap one is Spider Eggs, but not sure if those two go together. Just remember that each water level gives more XP, so use higher level solvents when you reach them.
Edited by Bryanonymous on September 7, 2016 11:45AM
If you don't use Poisons, then Mushrooms, other than Namira's Rot, are usually the cheapest in the guild stores. But, now that we have poisons, fungi prices may have gone up some.
Blessed Thistle, Wormwood, Lady's Smock are 3 Flower Reagents that I rarely use outside of writs, and find everywhere, so that is another group to look at.
Enjoy the game, life is what you really want to be worried about.
PakKat "Everything was going well, until I died"
Gary Gravestink "I am glad you died, I needed the help"