I recently purchase like 7 or 8 weapon elixir for 150K each..i have seen other players selling them for at least 200-210k. i'm planning on selling them for around 200k as well. (around 400k on profit....elixirs DO sell by the way)
so far i only have found 2 protector and 1 weapon elixir from mobs
what i do get a lot of is lvl. 24 weapon drops (mainly blade and sometimes glavie) from demon/devil horses
i get at least 4-5 per hour (no SOS though

)
during 3-4 hrs of SP farming i have around 10+ blades
i don't know if this if PURE luck or the drop rate in demon/devil horses is higher since i rarely got any weapons after hours of killing mobs before