I need help putting a value on a Thonet Chair and matching loveseat...bent plywood mid 60's.?

I purchased this set and my friend would like to buy it from me, but I have no idea what it's worth. Thonet Chair and matching loveseat, tags are intact. I have photos and will upload if Yahoo answers allows me to. It's bent wood and rubber/vinyl seating and arms. Very Danish Modern style. Almost looks as though it could be waiting room furniture. Any help would be appreciated!