Wedding gift?

My brother is getting married 次 month, but I have absolutely no idea what to buy him and his soon-to-be-wife. I am at college so I don't have a lot of money, so please keep that in mind.
My brother is 26 and his fiancé is one 年 younger. They already live together so they have everything they need for their house.

All ideas are welcome, I really need some inspiration.

Thank あなた in advance.