Lemme ask you something. Do you have enough money for the endo and the first vial of T? If so, you might need to keep saving up for transportation. If not, then gas money is the least of your troubles at this point.
I hope you find someone closer than three hours away, but you might not. In that case, you might need to tighten your belt even further to get what you want. Or wait until you are working, which is exactly what you are trying to avoid. It makes sense to start transition now and get the awkward androgynous stage out of the way before you go back into the work force. It might not be feasible, but it is a good idea.
Have you tried calling the two clinics you know about? You might ask them if they know of someplace closer to you. The LGBT center might not be as "in the know" as they should be. Also, I have found that in my city, real trans people tend to know about resources that the LGBT center is unaware of. That's why I suggested support groups and networking. If there is any support group at all in your area, check it out. It sounds like there isn't. (Edited: I made an oops. Can you e-mail someone in the group, maybe? Get a contact?)
Before I knew what my local informed consent clinic was called, I remember Googling for it. I was using keywords that didn't turn up what I was looking for. Once I knew the name of the place, I went to their site and looked at their own description of the services they were providing. Nowhere do they use the term "informed consent." The trans clinic operates by word of mouth, really. So I suggest that if nobody comes up with a name/clinic that is close to you, you start doing some legwork--that is, phone work. Find out about any endocrinologists who work with TG/TS people, and start making phone calls. Also, would it be possible to get a letter from the therapist you used to see, or is that out of the question?
Forgive me if I'm suggesting things you have already tried, but you might need to get creative. I'm just throwing things out there.
Sorry I'm not so helpful.
P.S. I found a list of endos in NY state...I'll PM it to you. But I am not familiar with NY state and don't know how far away all of these places are. I suspect that you've already ruled these people out due to their location.