Instapark via Amazon offers its Instapark Cervical Neck Traction for $25.95. Coupon code "UJVC3A3M" drops the price to $19.95. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's $6 off list and the lowest total price we could find. When inflated, it elongates neck muscles, purporting to improve circulation for muscles, tendons, and ligaments.