回複：問一下，YOYOTA Sienna LE 6 V 8座的多少錢能拿到？

costco offer auto program with no hassle price.
http://www.costcoauto.com/enterzipcode.aspx?gotourl=%2fDefault.aspx

or you can print out price from zag and ask dealer match it.
http://amexnetwork.zag.com/main.html

if you want save even more, get online quote from all dealers around you then ask each to match the lowest price your found. But too much hassle.