There were some other 'Doctor Who' costumes available from the same manufacturer. I've just been up into the loft to hunt mine out ready for the big day next week.
Alas, they are no longer in their original mint condition. The entire Voord costume has decayed and crumbled to dust as is the case of any cheap latex product.
And the Zarbi is missing its mandibles.
As for the Monoid, I bought it off Ebay as an original factory-sealed product for a considerable sum of money. There is something inside it but breaking the seal will lower the value of this highly sought-after collector's item.
And knowing my luck, there's probably just a crappy 'Star Wars' Emperor costume inside it...