Serum 207 is the cheapest.
Here's a helpful table for Herblore gp/xp ratios:
https://spreadsheets.google.com/ccc?key=t6TzpQoJwQNdzs2NHd63E7w&hl=en#gid=0
8-10k xp a hour omg lol...wowI find that these are a little easier to read than Determinate's link. Pictures always help
Potion prices - http://runescape.wikia.com/wiki/Calculators/Potions
Cleaning Herbs - http://runescape.wikia.com/wiki/Calculators/Herbs
Extreme Potions - http://runescape.wikia.com/wiki/Calculators/Extreme_potions
If you use MouseKeys and use your left hand to mash 5 and + while quickly mousing up and down your inventory, you can do about 8k-10k clean herbs/hr.
Not really...Tarromin has risen in price
XP/gp wise it's one of the crappier potions to make. Plus getting rid of it is a pain in the ass.
Anyone got any good ideas/ guides to level herblore? Looking for the cheap way. So far what ive found out is that making p pots you only lose 1.4k each pot made... is there a better way? thanks

