Yahoo is 199 for mainstream sites. 600 for adult and not worth paying since there are no guarentees. Get in the others and they will get you sooner or later.
If you do it right, you can get indexed in the smaller SE's and dmoz in roughly 2 weeks. It just takes reading the sites that have been listed here several times in other threads to figure out which way you like to get in and test others to see which works best for you,
What works for us, may not work for you and vice versa.