@kimo
Would your advice be to not use and keep buying potions etc and just continue to go back and forth to heal in Dothe or at the healing statues. I too am short cash to finish the skill tree and just trying to figure out where to save money when I replay the game.
I was only short on cash when trying to use the books in the Seaside cottage. I mentioned before that I was glad to have not found them earlier, because I would probably have finished the skill tree much later.
I would not buy any bombs again for 600 gold as I seemed to have enough fighting power to not need them. Also, there are two infusions (Aetheric Treasure & Golden Drops) that will give more goodies after battle. I equipped these as soon as I found them, but be careful because they obviously will reduce other stats. I usually had the bowwow equip the best one available.
As for healing items. Although I did get nervous on occasion, I found that Orfeas balanced the distribution of stuff rather well. I would suggest to not overbuy stuff (depending on your aversion to risk) and also finish the skill tree ASAP because the faster you can eliminate baddies, the less healing you will need. Yes, I did use those healing points in Dothe rather often. Since you don't get attacked in the wilderness, it's always just a quick run home. Also, I paid the gold needed to use the healing statues when available in certain "dungeons".