Edit: Just talked to a friend of mine who does interviews for her company, and apparently there's been a paradigm shift of late. Since grads want jobs more than employers need them, there's been a power transfer between the two. Instead of the employers courting grads, it's the other way around now.
Jos A Banks has a couple of sales going on right now, if that'll help? My dad tends to prefer Men's Warehouse (they have better service), but the suit prices alternate. MW will usually be cheaper if they're not in a mall, too.
If he had a good relationship with one of his professors, they might be able to help with the hunt. One of the interviews I had was because of that.
You might be able to get the ticket for free if you have some spare miles. It's still a pain, but marginally better. :/