ill say 5-8K. nothing really special about the stats except its max fire dmg and energy +10 which is standard for all max dmg staffs. the improve casting speed for protection prayers 18% chance is pretty good. improves skill recharge 8% chance is ok.
ebon string go for about 500g. i dont see any reason why a bow string should go more than 500g. i've seen some people selling fiery, icy, shocking, and ebon strings for 1K-1.5K. those fools buying at these prices are being ripped off badly. except if it's a really good or perfect vampiric string.
PC: Defensive Fire Staff of Pruning, Ebon Bow String
Night Daftshadow