Mish17,
You are whistling in the wind on the lawsuit. Oh yes, you can sue anyone for anything however winning is a different matter. I should know. I have given sworn depositions & have testified in court cases on behalf of breeders, handlers, & professional dogs. To begin with if it is a breeder's policy that they do NOT sell to someone who does not pick the puppy up in person, then you are done. They did not break a contract with you & they are not discriminating against you due to your disability. They DO NOT sell to anyone who doesn't arrive in person. That is their policy & their right. They are not a public entity. You might be shocked to know there are a lot of people who will pay, say, & do anything to get what they want regardless of if it's good for the pup. Breeders have this policy because over the phone, online, even facetime with someone the person on the other end only shows what they want the breeder to see. Anyone can keep up the ruse for even an hour on the phone. In person, it's harder to lie, harder to con, harder to keep it up during a prolonged visit. (I am NOT saying you are lying or conning... I am stating the reason that breeders have such a policy). You will be very upset by what happens in court should you pursue that avenue. It's your word against theirs.
The next thing is kind of hard to hear but I hope I can say it kindly. Has it occurred to you that you are not presenting yourself in the best light to breeders? I spent ten years looking for a certain type of Doberman. I interviewed over 200 breeders, saw videos, personally saw dogs from many of those kennels. That was to find 1 dog. I was told by many that I was too picky. They're right I was. I went through something very similar in looking for my Standard Poodle who has the qualities to be a working guardian. I had several people hang up on me, laugh at me, tell me I was crazy. I didn't take offense but I did learn how to approach the subject where they would HEAR me before they hung up, laughed, or decided I was mental. I learned to ask about the dog's parents. "Do you find them to be good watch dogs?" Sometimes I'd have to explain that I meant just barking at strangers telling them to get lost. Then I'd tell them I'd worked with some Standards in my career who were excellent guardians. That would get them curious & they were still on the phone. It is 100% truth, so that helps. I've had breeders tell me, "Sorry but my guys love everyone & can't wait to meet strangers." My response, "that's wonderful. The world needs dogs like that." I've made some nice contacts to help people when they call me looking for a therapy prospect, alert dog, etc... But my point is, rather than take offense use it as a learning experience & really examine how YOU appear to the person on the other end of the phone. The breeder may worry if you can't come get the puppy, what does that mean for the puppy? Will you be able to care for him or her? How will he get to the vet? How will s/he get exercise? These are VALID concerns. You may be slamming the door in your own face because of how you come off to the person on the other end of the phone.
Also, if you call a breeder & they don't return your call, that could mean something it could mean nothing. Again, it could mean you're not presenting yourself in the best light. It could mean phone trouble. It could mean they had a bad day & lost your number or couldn't understand your message (reception can sometimes be a butt when you're writing down phone messages off voice mail). I live in a place that phone communication is difficult. I have to drive 12 miles to get a cell signal. I am hard to reach & that's not by choice. Fortunately for me, when I found a pup I was interested in... I called... when I didn't hear back I emailed (both were VERY respectful & polite). I finally got an email from the lady asking me to call back on a different number (her cell phone was in an accident & she lost everything on that phone). Sometimes very legitimate things happen that's beyond the breeder's control. Be understanding if you want others to return that in kind.
There are people who will sell you a pup, sight unseen, just give 'em a credit card & have someone pick up the pup at the airport. The reason you are having trouble finding the breeder with this type of view of selling puppies who does hip evaluations.