i.e. pay $5 to go back 5 days.
The time travel is permanent and one-way.
Edit: this is a one time offer and your budget is however much liquid cash you have right now. Cards are accepted, though.
For non-Americans, feel free to convert $1 USD to your currency
You should watch the movie About Time, the guy goes back and when he gets to his present again he has a different kid because the sperm is basically random and you can’t choose which one makes it. Harrowing stuff.