Our local (and as I recall other places I've been recently) Barnes and/or Borders booksellers generally have a section of "clearance" or "bargain" books that is about 30% "travel" themed "coffe-table" stuff, with better than half of those generally about something or other more or less faux-Irish. You can often find things "originally priced" in the $20-$40 range for under $10.

The library is probably a better place to go for "solid" information, but if you happen to pass by one of the larger bookshops, it might be good for a little browsing.

Most of them in my area have a coffee shop where you can sit down and make notes (with a possibly decent cup) before you put the books back on the shelf.

John