Get yourself any lowbie cards. More than likely, they're used in Mr. Hatter quest that is unique to this server. Lowbie cards (e.g. Poring Card, Picky Card) are a minimum 300k each despite being useless. Be careful when selling though, some cards are worth more than others even if the monsters are easy (e.g. Peco Peco Egg Card, which is worth 4m++)
Anyway, I sometimes see people buying those Guitars for 50k each. Sorries.
Good luck and have fun!!
