Residence and insurance - the latest? (Istanbul)

Hi folks,
Chatting with some expats yesterday I heard that health insurance is a MUST now and you have to show that it's valid for 1 year (i.e. pay up front - not monthly).

I logged into Randevu this morning (3 May) and it presented me with the information that 29, 30 May and 1 Jun are all full!

What have peoples recent experiences been?
1. USD / mth?
2. Insurance?
3. Appointments?

(FYI I'm renewing)
Thanks!