...While at it, some examples of other train and flight ticket prices

Train schedule

Hints from a ticket-procurement expert

Recommended Trans-Siberian resources

Travel Escort

If you don't feel comfortable travelling on your own and yet don't want a group tour, try to locate your compatriots who travel the same route.

Another alternative is hiring a travel companion.

Let me know if you are interested, and I'll see who, from among my acquaintances is available. I'll try to set you up with an English-speaking buddy who knows the Russian railroad system.

Approximate cost: $50 and up per day plus expenses.