All the big hotels have one. Perelik, Murgavets, Pamporovo etc and the rate is very reasonable. A few people say they had problems using them, but we've been getting money out of them the past 8 years or so and never had a problem. They take all major C Cards.
I used my nationwide flex account card in the cash machine outside the perelik just last week and got 2.65 lev to the pound which was a dam site better rate than over here.