RCMoment offers the DIY TriFidget Spinner in several colors (Blue pictured) for $1.32 with free shipping. That's the lowest price we could find by a buck. It measures 3" x 3".
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily. Also, this product ships from China and may take two to five weeks to arrive.
You have heard plenty about the downsides of ADHD. But have you heard of the many unique gifts that accompany this brain difference?