As you are in the Veliko Turnovo region, I would suggest a visit to the Priti
factory at Lyaskovets, near to Gorna Oryahovitsa. They have all the Priti petchkas on display, and you can get a brochure too which gives all the sizes, heat output etc. We bought one in November. Think it was just under 400 lev, but it is a large one with an oven.