I know they were no longer working in June, this year, at least not where they were in June of 2005. A combo of US$, a few traveler's checks, and debit card served us well this June, both on the island and inland. Credit card for the big stuff--hotel, big tours, rental car--everything else in cash. Island Supermarket now has an ATM machine! If the phone lines go down, no ATM, so be aware of that. Had a bit of a heart attack, when bank said we got $500 BZ, and we got nothing. It worked out okay.