Intercity buses from Moscow: www.busgo.ru. Think of $10-something per 100 miles as about the average cost. Or, if you are a large group, hiring a bus in the city will cost you $50-100 per hour, and up to $2 per mile for long hauls.
Cruise ships from Moscow: www.starflot.ru/cruise. Prices from $200 to $2000 per person per day, eg. the cheapest of the cheap one week cruises will cost you $1400.