Maybe if you are going there on vacation you could have a look for this brand of boot which my friend Phil swears by. They are called Justin Boots . They are made in California but sold all over the US.
Here is the link to their site Justin Boots
They've got a list of retailers you can find either online - there seems to be quite a list - or you can browse the map.
Phil loves them because they have a good reputation and great selection. He says if they don't fit when you first try them on - don't buy them - they won't 'wear in'.
If you want to go upmarket and be really cool - there is a brand called Lucchese
They really are superb and not so expensive if you consider you'll be able to wear them for - maybe 10 - 15 years?
It's a good time to buy right now when you can get nearly $1.70 to the GB pound!
That makes this pair about £500 (if you include shipping)!
Here's the link to their site Luccese Boots