Sony is fairly reluctant to name the prices of the Xperia XZ2 and XZ2 Compact, which is surprising as the prices are actually pretty good. We scoured both Sony and carrier sites and we found only the German price.
The big XZ2 will cost 800 while the XZ2 Compact will be 600. Thats 100 more for the big one, but the price of the hasnt changed. Still, keep in mind that these are the first phones with Snapdragon 845 to be unveiled.
Sony Xperia XZ2 Sony Xperia XZ2 Compact
Both phones will be available in Q2. Maybe by the time pre-orders start, there will be a promo bundle unveiled the XZ1 duo had a deal with free h.ear wireless headphones. And even if we dont, the XZ2 Compact is currently the cheapest S845 phone.
Source (in German)