Actually, if you contact the manager of your local Wal-Mart (via phone or email) and ask for a good place for bicyclists to put their bikes inside somewhere then they will most likely take action. Me and some friends went to Wal-Mart one time and the door man was reluctant to let us put our bikes inside, but we asked for the manager and he came up and we asked him if we could park them in the inside cart area and he agreed and there has been no problem with it since.