You can get arrow from the slimes !
and at a higher level, with the harpy :3
Oh thanks for information, didn't know about harpy.. But Im just around lv 11-14. Monster in around spawn just drop 1 arrow for each monsters, but need more than that to kill one. Gold also just between 1-5 .. I always thought Arrow in shop was just 1 gold for maybe 10-50 but realize it was just 1. Almost out of arrows right now, collecting 50 gold also just hard