I am planning to visit Shatili with another person in the beginning of May. I know it's possible to get there using a 4×4. What is the approximate price of getting a transfer there from Tbilisi?
According to several sites there is no reason to take a 4x4 to Shatili as there are Marshrutkas running from Tbilisi to Shatili twice a week (Russian).
There is also another site in Russian that lists the times as of 2013 for the marshrutkas to Shatili and prices for others so you can guesstimate what this might actually run based on distance and finally someone who actually been to the village and prices they have paid and also the lastly most sites suggest hitchhiking to the village.