Depends from the type of font, family and resolution.
The are fonts that are in 5pixels resolution (used for Flash websites), and fonts for DTP
If you have connections you pay less than the normal, and sometimes you get and free fonts
The most expensive CD with "Some Byzantine style" fonts I payed about 600€ .
Also I have about 2000 Greek fonts...... expensive also.
Anyway, that's life, you pay and then you get payed