How much are driver services generally in Moscow? Perhaps my Rate guide will orient you.
Specials will also be announced in this sections. For example Free guide/driver in exchange for English conversation. Of course it will not be flawless English but quite a few travellers enjoyed free trips to Gold Ring or Staritsa and around Moscow of thanks to the barter arrangement.
Watch for Specials too. Find an office worker in a state of cabin fever, and you can easily get a deal “at cost”.