There are a lot of fakes for the actual stilts, skipping rope and the egg and spoon one. You can easily spot them as the plastic is a lot more brutal.
The Smurfs themselves (monobloc hard plastic) are often easy to find.
It is the accessories which are hard, as they have often been lost in the mist of time.
900 EUR for the egg and spoon or the stilts is a lot of money though!
I have seen complete sets of 8 going for 250 to 300 EUR (Which I still think is expensive).
I keep meaning to put that site up with all the pics... got to make time...
Cheers,
David