Your best bet is to find a local hydraulic shop. Some advertise as a hydraulic fittings supply house while others advertise for all things hydraulic.
You can look them up in the phone book and/or find a heavy eqt dealer and ask where they get their hoses made up. Your local tractordealer(s) probaby use them also.
Once you've located a shop, take your old hose(s) off then take them down. Most after market hoses are better than the OEM's and aren't as expensive.
For quick turn around and exact fit, I agree with Volfandt, but if price is an real issue, you can buy premade hoses at surplus center.com and discount hydraulic hose.com. I think SC sells them in 6" increments up to about 4 feet, then in 1 foot increments. DHH sells it by the foot or in reals if you can make up your own terminations. But again, the easiest and fastest way is to go to a local hydraulic shop where most will make up a hose while you wait.