Pretty sure it's 55 lev a day for a bit of snow fun, nursery and lunch. Not used it though, just know from discussions we had with our ski school people, so probably best to double check direct.
If you go with Rila- ask if they can get her on the nursery run a few hours a day if shes up to it- saw a few doing that this year, and they were doing well (Jims young one from here for one!)