Here's a seed which has a dungeon very close to spawn. You won't even have to do any mining or digging to get there. Once you've spawned turn slightly (diagonally) to your left and walk in that direction and you will stumble upon a cave in the ground leading down into a tunnel.
Take the first to the right in the tunnel and you will soon see the dungeon with spider spawner and one chest. In the chest you will find the following items:
- 7 gunpowders
- 2 wheat
- 2 bread loaves