There’s a selection of loose Kenner ALIEN parts for sale currently on eBay. These parts are all extracted from a tear down of the old toy and being sold individually. Some items have already been sold. The pair of arms, both tongue parts, dome, front torso piece and those four weird things that stick out of its back have already been sold. A good selection of very usable pieces still remain to be snapped up. These include the head, dorsal crest, rear torso half, tail, both legs, tail clip and a complete set of four screws.Here’s what remains to be sold at the time of publishing this post. Prices are in USD and seller will ship international:
$55 – Head.
$90 – Dorsal Crest.
$25 – Back Torso Half.
$16 – 4x Assembly Screws.
$44 – Tail (with Fastener). 
$38 – Left Leg.
$38 – Right Leg.
$15.50 – Additional Tail Fastener.

-Windebieste.