Also that phone is $100 in the US. To get the price in EU or most other markets multiply with an amount between 1.5 and 2
The price is the price at a Chinese webstore including shipping. Not sure about european custom fees, but wouldn't they apply to buying on ebay ?
Very few application vendors provide .apk's to install outside of Google Play and they don't provide them from other markets available internationally. f-droid has some applications but not a huge amount.
Basic functionality like Facebook, Twitter, 'sharing' photo's to social media,etc don't work if you can't install those apps.
What I ended up doing was installing Firefox (Mozilla provides apk's and it's available from f-droid) and using web apps.
Firefox OS on the other hand provides all this functionality out of the box.