Total Wargamer's army deals make it easy to start a new army.
The Tyranid Army Deal contains the following boxed sets and blister packs:
- 1 X Tyranid Hive Tyrant
- 1 X Tyranid Battleforce
- 1 X Tyranid Trygon / Mawloc
- 1 X Tyranid Carnifex
- 3 X Tyranid Hive Guard
- 3 X Tyranid Zoanthrope
Depending on how each unit is equipped this bundle should be sufficient to build a 1,500pt Tyranid army.
If you don't have the Codex you can pick it up here - Codex: Tyranids