A clip on mine broke after the second transformation... It had a stress mark when I bought it. Don't let the broken arm turn you off from the figure. It really is a good one when everything is working properly.
Assuming you have a valid (or fake, but I don't recommend that) ID, it can be returned to Walmart without a receipt. TRU requires a receipt for returns. I'm not sure about Target, Zeller's, or any other stores like that as I don't usually frequent them due to distance. Most stores in malls probably require receipts as well. Good luck with your effort to replace it. EDIT: Anyone notice we all just assumed it was Movie Landmine? If it's Cyb or Energon Landmine, he's pretty much out of luck...
My figure has a broken part on the mechanism for his left foot. In back, one of the rings that goes about the bar which acts an ankle joint of sorts is missing a piece from it. Looks like it may have been a stress break too. However it doesn't impede his functionality in any way so far.