I sell to Timmy and Tommy unless the store is closed. I really don't like the morning phone calls so I like to avoid those. Also going inside and seeing the interior of the shop helps me to remember if I need to pick up any tools or anything else.
If it's a substantial amount of stuff with value and they're open for business, I sell to T&T. If it's just weeds and flowers or if it's past store hours, I just use the dropbox.