canon的15-85mm镜头最近有instant rebate 活动,大家有听说过吗?下面是amazon 的 review里游人说的, 但怎么操作呢? ANOTHER REBATE ALERT, December 6, 2011: Canon is again running an "instant rebate" (the rebate should be in the price you see--you don't have to mail in some coupon) for this lens. This time it's over the period November 27, 2011 through January 7, 2012.