The most difficult part of organizing a karaoke party is, surprise surprise, actually finding songs for people to sing. If you have a very specific idea of what songs you want at your party then it might be cheapest to go to a karaoke downloads site which will let you download individual songs or let you combine them all onto a CD. If you find the right karaoke downloads site you can even get specific formats which will then display the words etc. on your ipod/ laptop.
Most decent karaoke downloads sites will give you a variety of different formats to choose from, just make sure that you download the correct one for your ipod, laptop or mp3!
Here are some 90s/2000s songs for you to consider!