In my area, the average low end apartment rents $750/month; let's say you furnish it frugally for $1,500; utilities will run around $30/month and household insurance will be around the same @ $30/ month - that will represent a total cost of $30,660. Now some of you will say you could live in a cheaper place; sure, if you can find one. Show me. I have found in the last couple years, rental vacancy has gone way down; they aren't building rentals now, only condominiums. You might find a room in a house, but then you don't have any sense of autonomy; there is always people in your space.
All other costs are the same, more or less. Food, health insurance, telephone (cell), entertainment; they don't change. If you go on a trip, well, you would have incurred extra expenses which you would budgeted for regardless. As far as computers go, you exchange your desktop for a laptop, a land line feed for a wifi card, more or less the same.
Above: Exciting new cities to explore, like Vancouver, BC