iTech Deals offers this LED Fidget Tri Spinner for $8.99. Coupon code "DNSPIN7" cuts it to $5.49. With free shipping, that's the lowest price we could find by $2, outside of the mention below. It purportedly helps relieve stress and increase focus. Deal ends May 14.

Note: GearBest has it for $3.96 with free shipping, but it ships from China and may take two to five weeks to arrive.