Is this a fair price to refurbish AC hoses.

I hope you know that R-134A is soon to be outlawed. It is a very potent green-house gas and overheating the world is now more a concern than the ozone hole which seems to have always been there before we started looking for it. I have HC refrigerant in all but 1 of my cars now (Duracool or Envirosafe) and works fine. After decades fighting it, the EPA now seems to be coming on board, though they still make it hard for shops to use it (must first convert to R-134A, such nonsense!). Whatever refrigerant you use, look at PAO 68 oil since it works better and doesn't absorb moisture like PAG does.

If your "AC guy" can't make hoses, you might consider another. I am just a home hack and have an AC hose crimper, bags of fittings, and hose. I bought it since I have several cars to install AC, and I can then sell it without much loss when done. You could do the same for much less than $540.