I had it done several years ago and am very happy with the results especially now that I'm losing weight.
If any of you wanting to get it done live in Northern Virginia you should see Dr. Tavalali (think that's the correct spelling, it's close at least).
As for cost, it was about 5k 3 years ago, (at least for me) not sure of the cost now.
Make sure you research the Dr. check out his/her record and make sure there are no major lawsuits or issues.
If you know or have friends who've had it done, ask to see their pictures if they're willing to show em and decide which "look" you prefer. Rounder, Perkier, etc. (yes, there are different "looks"), so know what you would like the finished look to be.
If you want a lift, go ahead and get it done all at once or you'll regret it. I wanted to get a lift and hubby didn't, I wish I'd ignored him and gotten it. They're not really saggy, but I think they would look even better had they been lifted a little. Oh well, maybe I'll get them redone in a couple of years.
Go a little bigger than you think you want because a huge percentage of people who do it wish they'd gone bigger after the fact. Notice I said a little bigger than you think you want but NOT 3 sizes bigger than you think you want
You can finance these types of surgeries also, so if you really want it, I'd say get it, but wait until you're at goal, because you are very sore (exercising would be tough) for several weeks at least. That way you're at maintenance and it doesn't set your weight loss back.
Good luck!