There are a couple ways to look at it. One is to get po'ed; another is to deal with it as a learning experience. My question to you is: Did You Have A Signed Contract!? If so, and you're wanting to prove a point, you could take him to small claims court, or the equivalent if you're not in the States. If not, WHY NOT? In the world of freelance, it is in the best interest of both the client and the freelancer to have (legally semantic) contracts, so that you have some measure of security in the event of situations like you describe.

Now, I know if I had lost out on a hundred bucks, I'd be stompin'-mad. Having said that, however, it is unlikely (unless you take him to court), that you will get it back. It sounds like you got hosed. Use the knowledge you just gained that not everybody in this world is honest, kind, and professional. Make sure you deal with both clients and contractors in the future with this knowledge in the back of your mind.

Just my two little pennies hittin' the floor.