Is this a fair price to refurbish AC hoses.

I don't think R-134A is going away anytime soon. New cars in the US are still being produced with it. The replacement is r1234yf that is quite expensive and as far as I know is only being produced by a joint venture Dupont/ Honeywell plant in China. Some German carmakers switched over to it as the Europeans have definite phase out plans for R-134A. Mercedes recalled there r1234yf cars and replaced the r1234yf with, you guessed it, R-134A, citing safety issues since under some conditions r1234yf is flammable and gives off toxic fumes.

I have yet to see a defined phase out plan in the US for R-134A. I suspect what will eventually happen is if r1234yf starts to really come in there will be a tax put on R-134A to bring its price up to that of r1234yf to discourage R-134A use. I suspect all this will be at least several years away and we should have time to stock up on R-134A.