Amazon changed their "advertised specials" policy. It used to be that all items listed in the Sunday newspaper flyers had free shipping; now, only those items that have a picture of a truck next to them have free shipping. Unfortunately, the website does have the "truck" picture. If you have the flyer, it is easy to tell. Amazon has the following policy posted, but it does not appear accurate, if the Rio Volt does not have free shipping. Here's the current policy on advertised specials:
"Enjoy Free Shipping on:
all Electronics advertised specials
all orders over $99 in Kitchen & Housewares
all orders over $99 in Tools & Hardware"