That all depends.
Ive generally found no record is worth a set price, its worth what someone will pay for it, on the day.
Ive seen copies between £2 and £10.
Also there was quite a recent white promo re-issue of this tune, INSANITY-99.
The mix on it could also alter its value.
I just dont know what stuffs worth any more, I seem to sell poor tunes for good money, and have ace tunes that no one wants to buy.
Anyway....