My only outlays were the trip to Houston, and a drive and overnight stay at a MicroTel when I stopped by the two headhunters's offices in Atlanta. Expect that your will be considerably greater, considering the state of the economy and the cost-cutting measures companies are putting in place.
If you are like me and you have been deploying, you should have a certain chunk of money socked away. If you are pending a deployment, you have the opportunity to sock a lot of cash away, so do it.
The biggest outlay you can expect to endure will be the travel expenses from attending job fairs, conferences, and (unless you are flown in by the company) flying to the geographic area where the company wants to interview you. Multiply this across five, ten, or fifteen sorties to sit down and interview with a prospective employer, and you can guess what the total is going to come to over a very short period of time.
You may, in fact, need to save on top of these efforts in order to put more money away for other needs. Like the 5 February post mentioned, you might need to hit your EAS, relocate (without a job in hand) and begin the search anew in the area where you think you want to settle down. All this takes a chunk of funds. If you are married, you will really need to sit down with your significant other and work out a budget for these outlays, so everything is above board and the both of you can understand the way ahead. Failing to do so is only going to cause aggravation for the both of you, at a time that is already stressful.
There's not much more to add beyond this folks. Expect your campaign to come at a cost. Prepare for it.
And enjoy some Foo Fighters: