I dont know where you live. And yes, they are hard to get nowdays.. Here in my country i only find those minitower cases if lucky.. It seems the desktops are more rare these days.
For me, ive planned my builds in back 2008.. so i knowing what to do.. If i buy some intrest AT cases i can useit, and the price is acceptable i will buy those..
For two of my builds, i decided to buy a whole system unit for only to get the right case.. Thats for my XT build i spend 300 euros on a complete mind looking system.
And spend 200 euros to get an AT desktop case (bought as a whole unit too) For the rest of the cases you need to keep your eyes open and look everywhere its possible.
~ At least it can do black and white~