No there's not 1 at the Bor/Edelweiss, or 1 close by that I saw. Prob be best 2 hire equip from in the centre of the resort coz then you wont have to carry it around as much.
I stayed at edelweiss n got stuff from behind the gondola station that was pre-booked with Balkan holidays.
I know Samokov hire stuff out from the ski school in the basement, my bro got a board in the evenings. All equip seemed fine and ppl were friendly.