I bought all these three years back for $1.99 per each.
But, it seems now Yahoo! has increased the charges to $34.95 per year.
Still GoDaddy, charges $6.99 per year and when you transfer your domain name from any where else to GoDaddy, then you get free, the time left on existing registration plus 1 year extension.
This looks cool and I am transferring all my domain names to GoDaddy.