Used to be able to buy tickets on the day at Maine Road for most matches from the ticket office at the back of the North Stand.Its ironic the club talk about the "fan experience" but don't realize it starts way before you get to the ground.
I remember many years ago early-mid seventies when you could get a ticket at the travel agents in Sedgley Park, Prestwich (not many ) but still quite fan friendly thing to do
From memory , I think you could pay on the turnstiles for the Kippax and Platt Lane (pre being used for away fans before it was developed) but had to have tickets for Main and North Stand.
One time I decided I would go in the Main Stand for a change (obviously not as far into my overdraught as usual) Tried to pay by cheque but they refused as they reckoned my signature didn't match the one on the back of my card (the only time that ever happened to me anywhere!!)
Just decided to pay by cash on the turnstiles at the Kippax instead . Really wished I hadn't bothered as it was the one when Roger Palmer scored a hatrick.
Great day that, the ticket office think I was trying to commit fraud and the team get battered 4:1 by bloody Oldham!!