I had a change to visit Biala and Obzor last year and let me tell you Bulgaria is an awesome and relatively cheap contry compared to other wester european nations.  If anyone wants to have a peaceful and quiet summer in an amazing scenic balkan setting, I stongly recommend Biala as a tourist destination.  For fun, shopping and other tourist activities, Obzor, located about 5km south of Biala is a welcomed change.  There are several places where you can stay, for minimal cost.  Maybe under $10 a day.  Most of these places are regular houses with guest rooms, etc.