Hi! I would really be very grateful (!) if someone could please help me translate this answer to an email, that I'm trying to respond to. Either in polite Ud.-form, or adressed to several people since it's a business and they refer to themselves as "we".
And I am a woman myself, if it helps.
Once again [..le agradezco mucho su(?) amable respuesta].
I am very grateful for all your help, and for the trouble you have taken.
I hope that I will be able to visit México some day, and maybe if I am lucky, you will still have a (/copy of the/) CD left in your store for sale.
[Muchas gracias] and all the best to you.
(or "best wishes", or some phrase with similar meaning)