Bought a 105 di2 group without the cranks from anrancee , after coupons, discount and a small import tax it came to about 580EUR delivered to the EU. If i'd cheaped out on the delivery i could have saved about 20 euros more.
The best price i have seen for a similar group is about 850 EUR + delivery.
Haven't mount it yet on a bike but it seems fine, all paired ok. I'm surprised the chain seems to be genuine (SLX/105), i was sure i was going to get a fake one.
On my package they declared the value at 100 or 150 EUR, but if customs smells something is wrong you could pay more in tax.