Local Vs National searches based on Product?

So people search for stuff online, but sometimes it's for a local product / service and sometimes it's for something purchased online.

How do I figure out that percentage?

For example, someone searching for a BURGER or a NAIL SALON, obviously, is looking for a local solution.

But someone looking for a DIAMOND RING or an ESPRESSO MACHINE might be more likely to buy online.... TIRES .... obviously, is more of a local thing.

But HOW do you estimate the % of local vs national searches for any given widget or service?

Anyone know?

Try using Long Tail Pro. It costs $99 but it breaks down both local and global traffic