One of the things that I hear so often from people is if I had more money then I could do more for my husband/wife. I am hear to tell you that you do not need money to do something thoughtful for your spouse. Something that I do for my husband just about everyday is to pour him a glass of sweet tea (his favorite drink) in his favorite glass and have it sitting on the counter for when he walks through the door from work every evening.
You can do it too...you know your spouse the best, you know the simple things they like, so surprising them with something simple will probably mean more to them than a hundred dollars! I know is does to me and my husband.