[prostance]

Can you buy toxin sacs and adrenal glands (they're for tyranids) seperately or do you need to buy some models and then use the ones which are included in the box?

 

[Creon]

Officially, the ones in the box. Battlewagon bits and other bits places may be able to sell you extra.

 

[bitsandkits]

http://www.bitsandkits.co.uk/tyranids-tyranid-gaunts-c-6_90_92.html