I grew up in upstate NY and generally the interpretation of "upstate NY" was pretty much anything north of Binghamton. You might want to narrow down the area a bit since there are probably places closer to you in NJ than some places in NY. 
...
Ah, I see from your profile that you're in the Capital District. There's GOT to be someone in Albany or nearby that is competent. There are several schools around there with serious music programs. Try emailing one of the low brass players in the Albany Symphony and asking who they use?
(Aside: I see that the Albany Symphony percussionist is Dick Algabgli. He was a physics graduate student when I was an undergraduate at Rennselaer. I also played in the RPI orchestra with him. He has an M.S. in physics. I'm petty sure he was my lab instructor for one semester. Many years ago.)
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)