You'd be best off farming kwuarms till 62 farming, and snapdragon from there. Sell the herbs, and use the profit to buy supplies for the herblore potion that loses you the least money/gp. If you really don't want to bother with selling herbs and buying stuff, just farm kwuarms and make super strengths until you can farm snaps and make super restores. You'd be best off doing the first option though. (Coincidentally, super restores are really cheap to make atm, so farming snaps is win-win).