My shampoo beef

What really drives me up the wall is when I go to a drug store to purchase a shampoo and want the same brand in conditioner to only find they sell the shampoo not the conditioner or vice a versa.
What drives me even more batty is when I go to a stylist to purchase a larger size bottle of shampoo and conditioner and they onlly sell tiny bottles. Or better yet one stylist will have a large bottle and I have to drive across the city slipping and slidding like i am driving on pure ice to get the large size of the other stuff from another stylist.
What happen to marketing you know. Man if they had everything that they should have in its brand we as consumers would actually spend more money at one location. But when I mention this it is like noone really cares about sales.