Now when it comes to magic items you're hard pressed to beat a wand of infernal healing for HP-GP ratio, with 500 hp costing 375 gp if you craft it yourself.
Of course the catch is that until 5th level, you're not going to be able to craft wands. still, 750 gp for 500 hp isn't a bad trade...
but I'm fairly sure we can do better.
Firstly, scrolls of infernal healing. Any wizard can scribe scrolls as of level 1, and it comes out at a fairly budget-friendly 12 gp 5 sp for 10 hp.
hmmm...
A healers kit has ten uses for 50 gp, or 5 gp per use. A successful dc 25 heal check to cure deadly wounds heals level + healer's wisdom at the cost of two uses. Not AS cost effective, but not horrible. You take a -2 penalty for each use of the healer's kit you lack, and if you don't use a healer's kit you also miss out on the +2 it provides, but if you have three people aiding another to boost your skill that's healing at the opportunity cost of skill points, that only works once per day.
Are there any other suggestions for cheap healing for levels 1-4? I think our best cash-based option is still scribing your own scrolls of Infernal Healing, at 1.25 gp per 1 hp.
Pay a cleric to accompany the party?
Healy Myrrh?
Potions?
I'm terrible with numbers and am not going to waste time comparing/contrasting the values, I'm just trying to think of actual sources of healing at low levels besides wands and scrolls.