I'm noticing a bit of an upward trend here too. I don't know if it's the economy being bad so there's more demand than there was (more people mending and learning to make what they'd usually buy?) or if eBay and other "research sources" have finally started driving the prices up.
I did sell my last "Extra" - a 411G - for $125 last week... normally I struggle to get $100 for them. I priced this one high to try to attract a certain type of person and got them.