Tractor supply is okay if you know exactly what you need, but you don't want to be trusting there sale people to tell you what you need to complete a hydraulic system. Hydraulics are not hard to do to install by yourself, the problem is there's a number of ways to accomplish what your trying to do. I suggest you visit your local "professional" hydraulic shop and let him advise/guide you as how to make up the system you want. I have always found the advise to be free. The hydraulic components will only costs a little bit more then Tractor Supply and the quality will almost always be better. I suspect you can put the system together for less then half of dealer cost.
I'm not knocking Tractor Supply, I'm just saying you usually get what you pay for.