If you get a real steel boned waist training corset it's probably not going to be really comfortable, especially on a post partum body. The one I have is like $17 at walmart and does fine, I got it in like 2 sizes smaller. You don't want one that's going to be super uncomfortable because then you aren't going to want to wear it at all.
i just wanted one that was really going to suck me in and actually work and heard waist trainers are really good but im going to check walmart out & see also. @their.bomb.ass.mom
I just bought one at Walmart, a regular belly band type thing, and I wore it after I got home since they press on your belly so much I didn't want to wear it in the hospital in case I'd have to take it off for that.