Keldath Ormlyr in the temple of Beregost gives you 2000 gold for a Wyvern head, but in my game he only accepted one. Don't know if that changes when you have Coran in your party.
"We are at a very serious moment dealing with very serious issues and we are not focusing on the name you give to potatoes" - Nathalie Loisau
I think the Wizard at the Sorcerous Sundries in BG buys them. I am thinking Iand I may be wrong, but the female in the bar in Beregost (SouthEast) I think she buys them. also maybe the wiz at highhedge. Look around you can sell them for sure.
Most people will buy them as regular shop items, but as mentioned above the temple in Bereghost is one of the only places where you can sell them for a biger price then their worth.
i have this problem, even tho i've killed dozens of wyverns, including the ones in cloakwood cave, coran still mumbles something like 'cant sit here and talk, got wyverns to hunt' .. does this mean his quest is broken or is that normal?
thanks in advance for help