I had a $12k quote in California, $9k in rural southern Illinois...and I ended up going to Costa Rica and getting it done at a fantastic office (clean, modern, upscale, English-speaking, and very friendly) for just a bit over $3k. I got in on Saturday, did a city tour on Sunday, dental work Monday/Tuesday, rainforest excursion Wednesday, final dental work and adjustments Thursday/Friday, flew home on Saturday. Hotel + airfare + food + tours came out to about $1200-1300, and the dental office drove me to and from the airport and all dental appointments.
Perhaps the best and most unexpected thing about it was that the dentist only worked on my teeth during each appointment - none of the patient-hopping my dentists here in the US always did.
Best decision I've made in a while.