The first pack we have is Planeshift. This came out in February of 2001 so a really old booster pack here. These packs go for about $8-$10 these days but sometimes they are much more expensive. Cards to look for are Orim's Chant, Lord of the Undead and Meddling Mage.
The second pack I scanned is from Onslaught which came out in October of 2002. These go for about $15-$20 per booster pack from what I have seen. Cards that go for crazy prizes are Polluted Delta, Windswept Heath, Goblin Piledriver and Flooded Strand. All of these can be over $30 cards.
The third and last pack shown here is Conflux which had its debut in February of 2009 so it's not very old compared to the other packs listed here. Look for Nicol Bolas, Planeswalker and the Progenitus cards in this pack.
That's all the MTG sealed packs I have to list for now. I did have more I wanted to put in this post but I had a problem with my scanner. Hopefully I can get more up tomorrow.
If you want a chance to win these cards it's easy as pie. Just read through this post I'm linking to below and you should have an idea of what to do.