I'm in Southwest Washington (state), and I'm routinely paying over sixty dollars to fill my 20-ish gallon tank. I seem to remember a time when I paid less than fifty, but maybe that was just a nice dream.
However, I was living in Denmark - Sjaelland, not far from Copenhagen - for the first half of this year, where the same sized tank costs over KR 600.00 to fill - US $120+!!! Thank god they have a great metro.