Alright, I know that this is supposed to be talks about low costs stuff here. And so it shall remain. One word: Picnic.
Take the wife on a picnic. Enjoy the sun together. Feel the breeze together. Fix sandwiches, add some chips, and get out there on the grass. Picnics provide great time to talk about nature, worship, and God. Best of all, they cost close to zero. And as a side note, have a “rainy day” plan. There is nothing more intimacy-killing than not planning ahead (aka – in case of poor weather). So be ready to have a good, inside backup plan. Plan to ask questions, not seeking to start conversation but seeking to know her better. Share your likes, dislikes, hopes, and fears. Be one flesh in this way.