Murrieta, CA, USA
I use one of these in my Maxima. Under $40 shipped. Haven't weighed it in a while but I think it was just over 10lb. Yeah, it doesn't last as long (12-18 months) but it's a cheap easy way to shed 25-30 pounds. Maybe it wouldn't do as well in a modern car with all of today's electrical demands but just throwing it out there.