Z.P.
The hospital (in Elk Grove Village) gave me one with both of my c-sections. It made a HUGE difference in how I felt and how well I was able to get around afterward. I didn't think it would make that much of a difference until I decided not to put it back on after my shower one day.
Find out if your hospital gives you one after a c-section. If not, then google c-section binder. You'll want one that covers your entire abdomen, and they can be kind of expensive. It would be much better if your hospital provides one and they can bill it to your insurance. Also, if your hospital provides it, the nurses put it on for you while you're still numb from surgery and get it nice and tight (not too tight!) so it's as supportive as you need it to be.