Well, at this point .. hard to say. D2r is just around the corner, so 50-70% of all players is going there. In addition, we are over 2 months into the ladder season. Bonehew is not used by too many, it is a temporary merc weapon at best, or barb or druid temporary .. Ethereal and perfect is still a great find, but i don't see why obedience or other runewords shouldn't be more desirable.. and those are cheap at this point.
For a trophy hunter, or someone with specific builds in mind, maybe 10 fg at most. But that would be a rare trade.
Perfect raven, well i think that could be 20 fg if someone needed it specifically. You could probably get more if you wanted and if buyer was rich and willing to pay. Maybe 50-100 too as an overpay. But that would be a very rare trade. 10-20 fg would be a quick trade.