Yes, you can buy them in bulk from just about any autoparts store. I replaced all of my rubber hoses 2 years ago, and I think I used a whopping 8 feet total between the 2, with some left over. Just make sure it is FOR FUEL INJECTION ONLY. Those lines are under a lot of pressure, and the fuel injected lines are stronger than the standard fuel lines that are used to feed the carbs.
1991 YJ, rebuilt 4.0L in spring 2009 at 234,000 miles, no lift yet, slightly offset wheels, 235/75/15 tires for now, rag top, sold the hard top. Over 35,000 miles on the rebuild and counting.
2006 Jeep Liberty. Nothing special, all stock.