First of all, Second Life is totally free. It will only cost you real dough if you decide to own or rent land or if you want in-game money to shop with. You can literally log in with a free account, make something wonderful in a community sandbox (an area that allows for temporary projects at no charge), and sell it.

How much does it cost to own land in Second Life?

Monthly cost: US$295 per island (to check current costs, go to Islands) Annual avg. cost: 1st year: US$5215; thereafter US$3540.