Good luck gettting one now though---the value and rarity of that mold has skyrocketed recently due to this add-on set. However, you may get lucky and find some of the ROTF versions at Big Lots etc being clearanced. Dollar General I think was also mentioned.
If you get desperate, you can try to buy individual bots---you do not need any of the accessories (like the hands or feet), nor do you need 2 of the 5 bots. A "complete" Bruticus is kinda pointless for this. (I've got a spare helicopter for sale BTW)