Thomas the Train "Mini's" on Clearance at TARGET in store, YMMV. $0.78 ea! [Central Texas for sure, probably elsewhere]
If you have a train addict toddler... this will get you some leverage. Target in Austin and suburbs has all remaining MINI's on sale for half off , 78 cents. Hit several stores and all had a few to boxes.
Pro Tip.... you can google the # on back to see what the train is b4 buying.