If I were you, I'd go for somewhere in Cataluña that caters for the crags that aren't already saturated with accommodation (Cornudella area). As far as I can tell, there aren't many places in the immediate vicinity to Oliana that cater to the English-speaking contingent. Could be worth looking into.
Or to the “speaking-most-european-languages contingent" for that matter. Despite having Swedish, English, German, French, Catalan, Spanish, and three slavic languages between us we couldn't find anything useful on the internet for low cost places in Organya (the most logical place for Oliana, Col de Nargo, Tres Ponts and Perles). I found apartments for rent by driving through Organya on google street view looking for posters. Found a telephone number on a big poster on a wall and had Mrs jwi call them...
Perfect accommodation though. Very cheep, nice, apartments in central Organya.
I realise how this could be improved upon...