Elan prices have been strange, I have seen a car completely in need of restoration on Ebay go for $12k USD and then a few days later I read of a guy sell his immaculate car for $12k. (it should have been closer to $20k). I was trying to sell mine for a time for $19.5k, but decided to keep it and have since put more money into it.
I would say expect to bay between $7-12k for a driver that needs work.
There have been a few on Ebay the past few months.
Currently, there is a butchered coupe on there with a Cosworth motor, it is at $10k right now. If the motor is good it is worth the money. A friend of mine had a cosworth powered Elan that would see off Ferraris