I too would rather have something finished and priced before being asked "Can I buy it when you finish it?" type question.
If you were providing the fabric $800 - $1200 would not be unreasonable.
OK taken in account your geographical location and the price point around there take the prices given here and adjust accordingly. Whatever I do not think you should give your time away and it looks like the bottom line might be around $500 - $600. (I would never do it for that, but then if it was a close friend I might consider it).