Just returned from Borovets, prices for a 6 day lift pass is 281 lev and for a one day lift pass 55 lev, exchange rate is approx 2.60 lev to the pound.
My advice is get a lift pass from your travel agent before you go it will be much cheaper.
Right Garry !
Another solution is to find a Bulgarian friend that will buy the pass for you, and to stay silent at the lift gates. However if you are blond, very white skin and blue eyes, no chance to pass because they will notice that you are a foreigner