Have seen several threads on here about where to find Kenner mega force toys. As a collector myself I have found several good lots live on ebay at the moment - I already have these models but these seem to be in really good condition and complete :
RARE Mega Force Triax Goliath - Kenner 1989 on eBay (end time 09-Sep-09 10:19:36 BST)
Here is just one of them. If you go to the sellers other items the rest come up.
Cheers. James