Got ours at International Gateway in the back of EPCOT. No line. No problem. Good for three months. Made our trip do-able.
Funny story last trip. Probably an isolated incident. Toy Story Mania - we got fast passes. Went back to ride. When we got to the point in the line where they look at your fast pass and let you pass through the gate, the CM said "do you have your Guest Assistance Pass?" The Fast Passes weren't out in my hand as I was pushing my son's wheelchair. I asked "do he have to have a GAC to ride the wheelchair car?" And he said "yes." (We had one, but Dad had it in his pocket and didn't want to ride this ride...also I thought not necessary for this ride.) He said he would let us go through anyway. Really a nice guy. I told him I thought that just having a wheelchair and not being able to transfer would allow my son to ride. He said no. I just went on up the ramp, a little confused. Great ride. Great accessibilty.
I got confused/stressed and never said "will these fastpasses get us on the ride?" Senior moment! He seemed so certain that without his kindness letting us go through (and I did appreciate him letting us through after standing in line!) we couldn't have ridden Toy Story Mania.