Need to be Punished Husband

My husband went to Germany last week. He asked me what I want him to buy for me. I asked him to look for a certain moisturizer. I gave him the target price in Euro. If more than that, no need to buy as I can buy it here.

He also asked me whether I had US Dollar. If I had, he wanted to bring it with him for emergency money. OK, I gave him USD 500,-

Last saturday, he arrived and he gave me the moisturizer. When I asked him to return the USD 500, he only return USD 500 minus the cost of the moisturizer!!!!