If you're looking for something that you can readily get for HP/MP... just do a few boss runs... those guys drop Elixers and Power Elixers like they're going outta style. Plus, they're free.
The first was when i first started playing. A friend of mine introduced me to it JUST after 4th job had become a thing, a lvl 50 warrior meant everyone wanted to be your friend for the Oh so sweet Rage, and before rolling the stats. I remember when I made me very first character that i wanted to make a Warrior/mage. so from levels 1-38 i split all my stats between Str, Dex, and Int. My character was SOOOOOO messed up that I couldn't even make the first job advancement until like lvl 13 because the requirement to become a warrior at the time I think was to have like a 30 minimum strength.
The second was after I made what is now my main on Broa when it was still Shezokna, now Yoshumari. It was when Pig Beach was still i thing. I think I had just hit level 52 at the time and I was just hanging out there, giving up that sweet sweet rage when, *GASP* and Iron Pig appeared!. Everyone ran for cover because they were all like lvl 28-32's and NO ONE could touch it. But BEHOLD! The brave warrior stepped forth and vanquished the foul beast! I got like 15 fame and like 2k meso out of it just for that. It was awesome. LOL
