We have a place called Hydra-Air...... Everyone and they're grandma gets there hydraulic and other hoses/specialty items from them..... Cost is an arm, leg and first born though.... I can buy new hose and ship it in for wayyyy less then they charge.... Only if I can't source it, I'll buy from them...
We don't have a Parker but we have several hose and fitting places. My favorite is Greenline, one of the oldest in the business and they carry most of what I need. What we lack is more choice of carpet cleaning hose. I just bought 125 ft of Blue Storm hose. 250 f. 4000 psi rating. Good hose but it is a soft outer cover. Great when going up and down stairs but a little more difficult to coil.