>I am currently using VFP 7, and I would like to upgrade to whatever is the latest version.
>Question1: Assuming 9 is the latest version, am I able to upgrade to 9 directly from 7,
> or do I first need to upgrade to version 8?

The latest version is VFP9SP2 and you can upgrade to it from any previous VFP version.

>
>Question 2: I have many apps that have been written in "7".
>Will they all run under version 9 (or 8) as is without tweaking them?

Unlikely but possible. See http://www.berezniker.com/content/pages/visual-foxpro/moving-applications-vfp-90
You'll have to test all your code in VFP9

>
>Question 3: Where is the best place to acquire the latest version?

I have seen VFP9 on Amazon. I'm not sure if it's the cheapest though.