Can I buy a Macbook Pro with a Spanish Keyboard Online? where do i find the option.

If you are shopping from the US Apple site, you can. You will need to select the model you wish to purchase, and proceed by clicking Buy. Part of the checkout process will be to select the keyboard language, as shown below.

What keyboards are available depends on what country you are in. Apple stores do not ship outside their own country, so if you do not see Spanish in the keyboard selection part of the purchase page in you country, you will probably have to travel to a country where it is available or have someone there get one for you.

You can always contact retails stores in your country directly yourself and see if they can get you one, but it's unlikely to be possible if the online store does not have them listed.