Thanks, BK. It never occurred to me, but I see that's standard business practice.
Since I'm the type who places an order on the web and then immediately goes to sit by the intercom waiting for UPS to buzz up, that's good to know that multiple-item ordering is not consistent with my personality type.

I'm exaggerating based on an old Jrand joke, but it happens with a place like Barnes and Noble more often than you'd expect - I've placed an order at 11 a.m. and the intercom rang at 1:30 with my book order.