If you are in America I guess it depends on what part. In the Midwest (Ohio), it is considered a common courtesy that seems to be dying out (probably due to the influx of people around our area from out of state). I used to see the offer constantly in the 90's and early 2000's, but people now get suprised when it's offered. Most have that "oh shit, really?" Look on their face. What I have seen alot  more of recently, semifat middle aged yoga pants wearing ladies with that short haircut that think it's OK to take a huge cart to the express lane (12 items or less) and as long as they split it into multiple orders it's ok. Oh and she is a super couponer. Happened twice in the last 6 mos.